With developers apparently jumping off the bandwagon it's natural to assume users will follow. As less development occurs other tools will become more integrated and easier to use.
As a user do you care? if i move to friendfeed, getting reconnected would be a pain, but i'm not really leaving much behind. Links are bookmarked in del.icio.us. Personally I don't really favourite many tweets. If I like a link I tag it. The real-time nature of twitter doesn't translate that well for long-term value.