Nintendo really should have abandoned courting 3rd parties after multiple generations of poor support whether the hardware was capable (Gamecube) or not (Wii). The interests of AAA publishers like EA and Acti aren't really aligned with Nintendo much anymore, and Nintendo just cannot make an offer that Sony or MS won't beat them on when it comes to Western 3rd parties on even terms.
What Nintendo should have been doing from about 09/10 onwards (they could still conceivably do it now) was:
1) Establishing multiple 1st party studios across Japan/US/Europe, each large enough in size to support development across eShop, handheld and home console releases simultaneously.
2) Create an international tech-focused team of middleware coders (similar to Sony Santa Monica/Naughty Dog's role providing tech and documentation for both 1st and interested 3rd parties)
3) Take steps to cover gaps in their lineup by starting new IP in Sports, FPS and "mature" open-world games (and I mean any kind of open world variant from RDR to Assassin's Creed to GTA, just any kind of big exclusive presence in that genre would be major - NOT Lego). Undercut their 3rd party competitors in these genres by taking advantage of the traits of Nintendo software (ie release 1 soccer game per generation and use bundling, DLC and Nintendo's long tail of software sales to keep sales of a single piece of software high over years)
4) Allow indies to round out the lineup as they are naturally enticed to markets (like Vita) ill-served by AAA publishers where they can thrive with the "free" shelf space. Set up a distribution scheme where "proven" indie titles above a certain sales threshold can be distributed as retail discs through Nintendo, formalising a process similar to Minecraft's disc release on 360.
None of this requires pushing hardware costs up, none of this requires moneyhatting 3rd parties, and it fills the huge fucking scheduling gaps Nintendo have experienced for at least 3 back to back hardware generations.
They would probably have had a killer launch app in Europe if they took the Wii Sports brand, spun it off into a standalone "WiiU Sports Football", and made a 5 player co-op football/soccer game where up to 4 players can play co-op as a team on the TV and the gamepad user is controlling the remaining players to make plays in a high-speed quasi-RTS mode.
I won't even start about the Virtual Console, where Nintendo are literally sitting on an "iTunes for games" sized store while Sony gets there first despite shaky on-again-off-again backwards compatibility.