With a twitter-like system, is there that much to lose when starting over, other than the community itself? I don't use twitter at all, but I'm imagining a twit

With a twitter-like system, is there that much to lose when starting over, other than the community itself? I don't use twitter at all, but I'm imagining a twitter migration similar to a * chan mass migrations; the only baggage to take is the people and their way of doing things. I suppose with twitter you get a history of tweets, but as I understand it, tweets are only accidentally preserved, much in the same way * chans are by archival services. But they're not really meant to be referenced 5 years from now, as a longer-form document might.