I was having a discussion with a friend about how Nintendo should've tried to get RPG makers on board with the Wii early on.
For instance, they should've pushed Square to Final Fantasy XII on the system at launch (without delaying the PS2 version), as well as that they should've tried to get the Kingdom Hearts: Chain of Memories remake as well, that came out on the PS2 in March 2007; technical limitations weren't a problem for those games, of course I'm not suggesting them getting FF XIII but having some RPG fanbase could've helped them in the long run.
As well as that giving the new audience the Wii had getting late ports could've been beneficial, Dragon Quest VIII, Final Fantasy X, etc. As well as their own RPGs, collaborations like The Last Story should've been there from the beggining not way late in the systems life.
It's pretty clear why they didn't though, things could not have been better for them so they disregarded third parties and just kept doing their thing.