I agree the PS3 is in real trouble in US. Right now it's hard to call an end date to the product, though I think.
Retailers do call the shots in terms of their final range, but in consumer electronics they also take input from the vendor. Unless PS3 really tanks, and assuming other Sony products are selling okay (TVs, etc.) then Sony will likely retain enough input to keep PS3 on shelves whatver happens (although if PS3 continues to slide in demand in US you'd be talking a very small presence).
The big unknown is the impact of a price cut (and what MS would do in return). It seems clear a price cut would stimulate sales, so until we see the impact of any cut (there will be one before 2012 I'm sure!) and what MS do about it guessing now about 2012 is ignoring a couple of big changes that are sure to happen.
But I'd agree that while globally PS3 isn't doing terrible considering where it was, the US is a key area of concern for the console.
Try to be reasonable... its easier than you think...
