Reasonable on 14 July 2009
I'd say around 1.5 M to 1.8 Million. I really like R&C games, but there have been a ton of them, I think the PS3 install base is a little weak for R&C titles vs PS2 (not due to size but demographics).
Therefore while the install base is much larger than when ToD launched, I think competition is stiffer too in terms of other titles.
On the other hand I heard it might have the funky MP back in place from previous PS2 games, so if that takes off it might well sell more - after all I'd like a break from gritty online action for something as zany as R&C online.
Try to be reasonable... its easier than you think...
