I wouldn't be worried. Wii U will do fine. It has a strong base and good games, what is there to worry about? Your points are good and all, but still, you seem to be ignoring the elephant in the room, that is the PS4 and Xbox 720. We clearly get that those two machines will be powerhouses, but at present, developing for them could potentially be twice that of current gen. You could even see games being stocked at 100 dollars or more. Wii U seems like a safe machine that developers are going to want to get behind, if not for the reduced price with HD graphics. It's online infrastructure is going to be quite good, if what Nintendo says is true.
So no, I'm not worried. What I am worried about most is the PS4 and Xbox 720. Those two have the potential to make the 9th generation a one console market. As far as sales go, Wii U will more than likely win next gen. Mostly because it offers a different experience than the HD twins, why get the same old controller when you can get a tablet controller? It coincides with the tablet fad as well. Nintendo is releasing this at a good a time as any at least.
In terms of hardcore, I really don't see Nintendo chasing them as hard as PS4 and Xbox are. If Nintendo was, it would have a crazy tech in the hood to please that crowd. I think it's just Nintendo doing a little of both, which is fine for now. The Wii has a good fan base which will readily transition to the Wii U if Nintendo proves them with a unique, casual experience, as well as some niche hardcore games under the hood. Nintendo doesn't need to be a graphic whore, chase the hardcore, or any of that to win. They'll win because of their uniqueness and the fact that PS4/Xbox are looking to make gaming a luxury.
At any rate, time will tell. Next gen I'll only be picking a Wii U. First Party HD + Third Party support is enough of a sale for me.
Zero Escape: Virtue's Last Reward = best game ever made.
