Maybe it's the CARS program, I do see equal numbers of Gen 2 & 3 Prius showing up on the roads whihc I drive by daily. Not to say they're showing up at once, but the pop-up frequency between Gen 2 & 3 is nearly the same.....
Not so much here in Dallas! I see a few mostly Gen II! However the day I went to transfer my tolltag, there were three other Pri drivers doing the same thing. All Gen III, the most I have seen at one time. I live too close to the land of the H3/Escalade/Yukon.
Most of the priuses you see here are taxis. That doesn't necessarily mean that most of the priuses here are taxis, but the taxis are on the road almost all the time, so you see them.