Wii has a lock on this gen. It's the system that has captured the popular consciousness like PS2 the gen before. There's no point in hoping for PS3 to consistently sell Wii-like numbers, which it would need to do to have a hope of at least overhauling the 360 gap. An good performance for the rest of this gen for PS3 in Americas (or more specifically USA) is to sell on par or slightly above 360 on average.
All PS3 can do in the Americas is hold the line to maintain sufficient momentum and proximity to 360 to successfully launch the next generation. Don't go hoping for anything more than that.
PS3 had a crappy start to the generation and had to desperately play a catch up game. Sony clawed it's way back to a sustainable position in the home console market and is sitting very comfortably now. Be happy that you didn't buy a white elephant that dropped out of the market with very few decent games only a few years after launch. It's what the doom merchants were predicting, and I reckon it got pretty close. The Playstation brand is on the road to redemption (if only PSP would do its bit too) but it's not going to fall and rise all in a single generation.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
