Bingo. The first console I bought this generation was the Wii. When I had friends over it was a lot of fun, but everyone else owned a 360. I ended up buying one myself just so I could play with them online, and my Wii stopped seeing use altogether for years until we got Netflix (now that's the only thing it's used for).
The other problem Nintendo is going to have is getting back the market share that Microsoft and Sony already have. Are you going to buy Call of Duty 9 for the Wii U, the Xbox 720, or the PlayStation 4? More people will be playing on the Xbox/Playstation (based on this exact same logic...), why would you even consider it for the Wii U?
I don't think Nintendo stands a chance at gaining the hardcore gamer back. Good luck to them anyway. I really hope they can prove me wrong.