Maybe, when 2.0 launches, a lot of people will decide to wait and see before moving their assets. If not enough people switch their activity to the new chain, 2.0 could fail.
(And in the mean time, the Nxt community is incurring a huge opportunity cost as man-years of effort are poured into 2.0 instead of into other features.)
All this is potentially true. However, I think many of the major assets will have moved to platforms like Waves long before any of these other things happen. What makes a platform attractive is # of users and the Nxt Asset Exchange destroyed its ability to keep market share. So it will be replaced. Yes, some will be lazy and stay, but not the ones interested in their immediate future.
I think these platforms like Waves first need to proof themselves. Companies don't just put their assets on a alpha-platform with low fly hours. Nxt has the best AE in the crypto world.