Diomedes:
If you look at the graph of last year the february sales kind of predict where the weekly sales stabilize. So PS3 had increase from a few good games, price cut, white version and of course holiday and is now stabalizing around 20.000 just like last year.
Wii sales will probably drop as well, but had a huge Brawl boost (and WiiFit seems to be an incredible system seller).