iChat isn't the only application that does that. At work, I use Sun's online Shared Shell to collaborate with colleagues. At home, I don't need to share my screen with anyone really.
So I don't see what about iChat makes it so fantastic, and again, CONTEXT, I don't see everyone using iChat. Not even close.
Both posters, the one claiming nobody uses Facetime, and the one claiming everyone will use it once its in iChat, are completely blind and irrational. Some people use Facetime, some will use it in iChat if it comes to iChat.
That's the problem with extremists, they don't seem able to understand the world isn't Black and White.