it is sell very good indeed
but not as good as others
now, if your question is : what could sony do for improve the PS3 sales in US, I would answer : NOTHING
keep getting good games, keep pusing the BR player, 3D games, Move, free online and slash the price if the situation becomes to bad.
In clear, it is not about winning the game, it is about to not lose it by too much
Time to Work !