i've had tricams on and off my rack for years. Most recently, carried four of 'em at Red Rocks, and placed one in a pocket where nothing else would have gone, but mostly just because I could; there were other options. I used them passively a fair amount.
I think they are way overrated in camming mode by those that luv 'em. You can usually get a cam in that is as good or better. With an occasional exception, of course. And skilled or not, cleaning them is a pain on steep ground when you are tiring and have only one hand to work with. It seems like the leader placing a tricam means the second will have to use aid, and the party will be slowed down (which is fine in the Gunks but not so good on a long route).
On the other hand, I think tricams are way underrated as passive pro, especially for places like the Gunks where pebbles in the crack can ruin nut placements. Sliding those rails around a pebble and setting a tricam in a constriction guarantees a bombproof placement.
The sewn slings are another problem; people keep using them for years (a practice to which I plead guilty), probably long after the slings are adequate for their purpose. And the nature of tricam placements seems to wear tricam slings far more than cam slings.
So, the tricams are in my pack with the Ballnuts and other swat rack gear. My partners don't like 'em much, so they don't make the trip up the crag very often, but I'm still ambivalent personally. As for the new small sizes, I agree that their primary effect will probably be a wave of ugly fixed gear.