Sony should not change any thing EXCEPT their marketing :
They have to FOCUS on game and stop making stupid advertissement. What to do for this Xmas for example ?
Put in every shop a trailer showing GT5/Killzone2 video. Same for TV : just make an adverstissement with the GT5 trailer.
Personaly, I believe in the Combo Theroy:
Wii/PS3 or Wii/Xbox360
Even if third party are coming to the Wii, I predict a LOT of mini-games.
The Wii will still be appealing to casual (price+fun) but more time will spend more PS3/Xbox360 will drop their price and more "mature" games will come.
These mini-games for casual will help to finance the big project coming for the Xbox360/Wii.
So if people want to play more "mature themed" game like AssassinCreed/GTA, and some others typical mature themed franchise usually present on the Xbox/PS2, they will have to buy a PS3/Xbox360.
The PS2 users are buying the Wii becuase it is cheap but they are/will dream about getting a Xbox360/PS3 later.
For me people will buy a Wii and after a PS3/Xbox360.
Overall, Wii will open the market to non-gamer (WiiFit) and will sell a lot.
I dont think the PS3 will be able to sell to non-gamer except maybe if BR succeed to spread to mass market.
I think that with the Wii the market will increase from 150M to 300M console gamers.
Time to Work !
