One "hook" is having the high budget top-of-the-line visual experiences from the majority of the third party community (specifically Western/PC developers). I'm sorry but the 360/PS3 ended up with way more third party content than the Wii, and honestly I don't see that changing all that much next gen.
Even if Wii U gets ports, they're going to be scaled down and who wants to pay $60 for games running at 1/2 resolution, lower frame rate, less effects, etc. etc. etc. (people are already complaining about Assassin's Creed 3 on Wii U not having all the same particle effects, ports of top of the line 720/PS4 games will be far worse in their compromises).
The "hook" for the XBox 720 too I think is going to be that it's going to be more than just a game console, it's going to like a cable box/direct competitor to the iTV from Apple.
And Kinect 2. I'm not a fan of Kinect, but I think Kinect 2 is going to bring much more accurate motion sensing than the original Kinect.
And yeah I agree with some other points made in this thread, a lot of the "hipsters" and soccer moms who fuelled the original Wii to big sales are not going to come back. They got caught up in the craze, but video games are not a central part of their entertainment diet. Now that they all have iPads/iPhones/Facebook gaming, they're content with things like Angry Birds and Farmville. That's the "new" hot thing, "Wii" is soooo 2006 in a lot of people's eyes.
