Point 4 shows a part of what could be one of their main problems; people keeping their PS3's instead of upgrading. Wii U didn't have this problem since the Wii's support had been severely lacking for years already which compelled people to upgrade in order to get new content. The Wii U also features full backwards compatibility which makes it possible to save money by selling the Wii after buying a Wii U. Potential PS4 owners will need to keep their PS3's, and if Sony keeps supporting that system that might be enough to keep them from upgrading.
(Because it's pretty much confirmed that PS4 won't be backwards compatible, right?)







