I disagree.
The gap right now, is 5 million in the US and worldwide, it might be 7? million. I don't have exact numbers but I thought it was 13-12-5 million for Wii/360/PS3 respectively. Every month, US sales of 360 are at least a couple hundred thousand more than PS3. PS3's Japan sales, except for very recently, have been perhaps 60,000 or so more than 360's monthly sales. Europe, PS3 is doing a bit better than 360 but the 360 ain't dead. So with an estimate, the 360 is still pulling ahead of the PS3 by tens of thousands of units a month. Not to mention the several million unit head start.
This trend, contrary to theBishop's baffling chart, seems to be continuing. 360 isn't going to drop off in the US anytime soon as hardware and software sales are still going strong. With other price drops, there is little reason to suspect that 360 is going to tank other than the masturbatory fantasies of disgruntled Sony fans.
By the time such a PS3 slim model would come out, at current rates, 360 would have a 8-12 million unit hardware lead over PS3. It would take a year or two for Sony to catch up and again, this assumes that 360 sales would go down to 0 once the PSThree comes out.
I don't want the PS3 to tank but a lot of these predictions about some kind of PS3 resurgence is pure fantasy. Metal Gear Solid series does well but not enough to completely change things around. Same goes for Final Fantasy. We've seen Minna no Golf and Musou do less than half of their PS2 predecessors and they were considered the big dogs in Japan. Other territories aren't putting up strong numbers either. To assume that PS2 sequels will cause Sony domination is no longer true. Sony's best hopes are software like Little Big Planet and Home.