The combination of ongoing PS3 exclusives (wtf Sony) and every third party game for the first two years (I guess) being dual this-gen/next-gen will very much hurt PS4 and 720.
The number of next-gen games that feel like they need a new console to be awesome will be limited to Killzone 4 this year. Halo and Gears don't come out this year. Everything else that could is third party.
Wii U does have two big shiny reasons to buy, ineffective as they are. 1. differentiated hardware, the tablet is defininitely new. 2. definite and obvious improvements to online, graphics, account system, social from day 1. Live and PSN are already great and full of content today.
Now it will be MUCH worse if they don't make PSN extremely fucking compatible with everything transferring. Feeling like all your friends are on PS3-PSN while you're on an empty PS4-PSN will be a very good reason to not buy.