If Beckham plays well and gets popular and people start to understand Soccer, then when England calls him back for Internationals, Galaxy fans will seek out the matches to follow their player. That will get them hooked on Internationals. When the World Cup rolls up next, you'll finally be like the rest of us.
I have a lot of faith in Beckham to play better than anyone else in the US. He has to, really, and if he does, the richer teams will try to buy more European and South American players and that, my friends, would be fun to watch.