As you said, this is for fun. It's certainly not a business or something I'm going to take much further, so the long-tem viability of Twitter's platform doesn't matter that much to me.
That said, it is where the people are, and I haven't found anything that let's me feel the pulse of the global online community as well. As I said, I think Twitter's a blast during a big live event, and that's why I built this.