>I don't think Twitter is going anywhere; it has a huge user base and a lot of people think of it as a branch of the internet.
It's not going anywhere in the next year or two. But in five years? Ten years?
Twitter's main problem is that it has one product, and it's possible to get bored with that product. It's not really possible to get bored of googling things or buying things off amazon, but it's entirely possible to get bored of twitter.
Remember when every man and his dog had a blog? (Or possibly a livejournal?) Remember when the word "blogosphere" was all over the news? What happened to all the blogs?