well you never knwo PS3 may catch it because it has alot of games that appeal to gamers. The wii has a lot of crap plus a few casual games peopel buy in BILLIONS and Nintendo games that people buy n ZILLIONS.
On the other hang the less quality PS3 games got their own smaller audiences.
However, If ubisoft were to relase 18more Just Dance games I don't think PS3 will catch up.