[ineedtosleep]

I think I agree with your premise, but maybe not the delivery, but I also think the other comments about the Myspace -> Facebook and Digg -> Reddit moves are significant enough to believe the opposite. These days IMO users don't want to re-learn something that's not just ingrained into daily life, but ingrained into minute-by-minute routines.

Personally, the biggest platform move I've made was the switch from IGN boards (objectively the top 1% of message boards at the time) to Reddit. During the switch it felt completely wrong and different, but as time passed I saw how much more Reddit offered compared to a traditional message board. I hope there's something out there that would make me feel the same with this next transition, but so far I don't see much for me yet. All I can see in the near-term is (hopefully) more productivity.