These are all questions that should NOT be answered by a committee of people who judge when and wether a pin should be replaced or not and then do the replacing.
You are in essence asking this committee to take over some of the individual's climber's responsibility in protecting themselves with the resident gear they come upon on the cliff.
What committee are you talking about? Education about issues affecting the climbers in the Gunks is an ongoing effort by the GCC. But that's it. Toward the specific issue of fixed gear, I have mentioned the possibility of guidelines for replacement. Guidelines that would add more specificity to the Preserve open replacement policy. These guidelines would have no impact on the personal responsibility of climbers.
The only specific approach I have even tried to formulate is one of a review policy ... whereby a climber in the community brings up the possibility of replacing an old piece of fixed gear. Under current Preserve policy such a climber has nothing to prevent him from replacing the piece at will. But if a few basic guidelines were set up, that climber would have to meet some basic criteria before going off and replacing the piece of gear. Honestly, I don't know if even this minimalist approach would work.
I have stressed several times that the GCC is currently very busy with many fundamental programs to make itself viable as a local advocacy group for the climbing community. At this point it does not have the ability nor the time, and more importantly, it does not have the authority to manage a fixed gear committee. If the GCC were to ever get involved in this, first it would have to find out if there was a broad concensus from the local community.
Personally, I do think any climber impact on the cliff is a GCC concern. But I don't have any definitive answers as to how the GCC could best help implement a responsible, productive fixed gear management policy.
And you know what? Even if tomorrow, the Preserve and the GCC created a fixed gear management committee and supervised the replacement of fixed gear, this would not take over one iota of individual climber responsibility. It doesn't matter if a climber comes upon an old manky pin, or a brand-spanking new pin ... each climber is responsible for evaluating that point of protection no matter what it's apparent condition.
But such a committee as you mention is not in the works and I doubt it ever will be.
Again, I ask the question, when was the last time you climbed at the gunks? I admit to being a resident climber here only over the past 8 years so I don't know what it was like back in the day, but, I know very few people who rely heavily on any of the pins and I know fewer people who carry a hammer, which is necessary to properly evaluate the utility of a pin.
The last time I climbed in the Gunks was about when you started climbing in the Gunks. I would hardly call that "back in the day."

Yeah, the best way to truly evaluate a pin is to have a hammer with you, but even without one, it's possible to get a pretty good idea on how solid a pin is. A good rap with a carabiner usually will let you know if there is a solid "ring" to the pin. That and some visual inspection can give you a basic idea if the pin is generally okay or utter crap.
If the pin was placed by the first ascentionist, then, by using your logic, the pins should be gone and we should all carry pins and hammers, because that is what the first ascentionist faced, I know, I sure as hell wouldn't have wanted to hang out and hammer that f'n pin in when I led it... That's not by my logic. Because I could never defend that argument. That sort of thinking would require all of us to carrying a bolting kit and rebolt ever bolt we come across ... even if it's on a sport route.
No one climbing a route after the FFA will ever put in the same effort that the first ascensionist did. The ethic on climbing established routes does not require you put in exactly the same effort the first ascensionist did (re-pinning and re-bolting), but that you do not attempt to alter the route from the manner in which it was established. Or use any types of assistance that did not occur on the FFA (hangdogging, pre-inspection, as pertains).
Of course, I know many of the hard routes were aid lines so there were probably in-situ gear by the true FA'ers or their repeat ascents..... Which, in the Gunks, encompasses much of the fixed gear found on many of the routes we have been discussing.
Bolts are an entirely different story. In what way are they entirely different?
And, practically speaking, there is even much less of a threat of random people chopping and re-bolting then there is of repinning being done..... Given the hardness of Gunks conglomerate, you would think this was true. But looking back at the bolts war of the 80s, people were far more apt to put time and effort into bolting, chopping and re-bolting than replacing pins.
Can you afford a HILTI, know many climber's that can???? I can afford a HILTI. A lot of climbers out here in the west own them. But I don't think that's part of the issue. There are few bolts in the Gunks. But those few (like on Arrow, Never Never Land, and C&C) seem to get replaced with more regularity than the pins.
I don't know what it was like back in the day, but, I know very few people who rely heavily on any of the pins ... I don't know if there ever was a time when Gunks climbers relied heavily on pins. Except maybe the era when many of these climbs were created with aid. Or maybe the era in the 60s when many aid lines were being freed with the original aid pins still in place. Even then, I doubt people like RG, McCarthy, Williams and crew were really *relying* on these pins. They had to make individual choices and decisions just like all of us have to. If they didn't like the original fixed gear they found, they made a decision to either live with it or back it up. (As RG has recently mentioned about his FFA of Coex.) After the arrival of Stannard, clean climbing was here to stay.
If I have said anything that has given the impression that I am advocating any policy, committee or plan that attempts to remove personal responsibility from individual climbers, than I apologize. I do not, nor will ever advocate any system, plan, policy or guideline that attempts to do that.