I think the best guesses have to be somewhat nitch games/series that have cult followings. I don't really see Nintendo pull off a "steal" of a major franchise unless they are willing to really throw out money. Nitch franchises would be cheaper on their end yet still cause an uproar on the Internet boards.
My picks (to fulfill my own desires lol)Suikoden
Vagrant Story
Skies of Arcadia
Shenmue
Panzer Dragoon Saga
Red Dead Redemption
My picks (that'll never happen but cause the biggest LOLs)FF7 remake
GTA
Call of Duty
Madden
Elder's Scroll ( or any major western rpg franchise)
My 2 serious picks (to claim my exclusive Caterkiller reward lol)Tales of (mainline): reasoning: Namco needs to show some love for being allowed to assist in the next Smash Bros
Shenmue : reasoning: Sega and Nintendo have been getting closer especially with the recent news. If Shenmue is to ever be reborn, I think now is its only chance. Release an HD release of the first 2 and then 3 proper to close out the series.
I'm holding you to it Cater