Here I am watching the GSL3 finals stream and seeing the insanity unfold.
 
It does seem bigger then GSL2.. does anyone think this is going to get football stadium big at some point?

It'll keep getting bigger with Blizzard backing it up, constant patching and two new expansions coming along the way. The experience behind GSL needs to be ironed out however, since there's a lot of technical issues that happen during the tournaments. Not all of them are to blame for Battle.net, but its certainly an issue that there is no LAN.

"          

   That was for Broodwar...  I can see SC2 going to be bigger. "

It can get as big as the games that are in it. And looking at how popular SC2 is, that's pretty damn big.
 
I've never played SC2 but am amazed by the people within the GSL, because they play at what looks like superhuman speeds. It's got the appeal watching someone do something that you can never do. I imagine that people who actually play SC2 get a little more enjoyment out of it, what with being able to see and appreciate the tactical nuances that are on show.