What is driving the Wii I do not think has much at all to do with the cube. The entire Wii strategy is not about carrying over last gens legacy but about building something new and different. Nintendo was in poor shape brand wise, so re-imaging themselves cost little. If Sony wants to go that way they will need a new way of thinking about gaming, new IPs and a console that starts out of the box in the or near the consumer price range. They will also probably alienate some of their current faithful and if they are just going to basically copy the Wii they will not be moving into virgin territory but having to fight it out for space there. If they have something completely new and different and even broader than the Wii for the public then your plan might work great sales wise even from a really weak position.
Proud member of the Sonic Support Squad
