Yep PS3 numbers look optimistic. I.e. there is a decent chance it will be below your low range. For information, the lowball estimate from your numbers is 4.115 Million by October 31. Wii numbers look about right since it is roughly what they say they will be making. And I have no idea what that prod on November 13th is for British people -- and I'm British. Were you thinking of November 5th, which is Fireworks night??
Well they've sold roughly 3.3 million consoles in 6 months. Do you really think the next 5 months would only sell 800k consoles? If that comes to be the case, I think sony's only option would be a huge price cut.