Until Sony's best games release the PS3 will find it tough to match 360 sales in the US.
As for the long term profit of the PS3 that depends on when Sony drop the PS3 for their next console. If Sony drop it after 4yrs like Microsoft done to the Xbox then the PS3 will make a massive loss, but if Sony support the PS3 longterm then the PS3 losses will become gradually less.
I honestly can't see Sony releasing another console before 2013 at the earliest. I can see the next Microsoft console also competeing against the PS3.