No, Pokerstars is here to stay. You have nothing to worry about at the moment. I don't think there will be anything done regarding online poker in the near future. What was done a while back really stopped a lot of new players, as well as some online poker vets, from playing [online].
Who knows, though? They are probably still obsessing about all the taxable monies they're missing out on.
Pokerstars is classy ****, though. Certainly no Party Poker. Mike Sexton can eat a dick for breakfast. If you love tournaments, Stars will be fine for you, and even if something should happen and they stop allowing US players to play, you should still be able to withdraw your balance without issue.
Good luck!
