I can see the potential of Twitter. But to be honest I think it might to slow down and lose its buzz after a while. The reason is that people use it to promote themselves more than anything. I think people who find it diverting now and follow others will get a bit sick of it. I mean, what's in it for them?
You'd only really get into it if you posted heaps of tweets all the time. And who has the time and/or energy to do that? Celebs, mainly! Even they will become exhausted after a while. I may be wrong, but I suspect the craze will reach a plateau pretty soon.