I mean, let's take a look at shit that Square is completely capable of doing RIGHT NOW for very little cost to them that would make at least one part of their long-suffering fanbase happy, and make them an absolute shit-ton of money. FFVII for home consoles is disqualified because, for the sake of this, I'm buying into Square's own argument that it is somehow it's impractical. It's not, but for the sake of this, let's pretend.
1) Remake FFVII for PSV: Seriously, most of what anyone wants out of that is better graphics (meaning they could just be lazy and deliver PS2 caliber and that would be perfectly fine), better sound for the ageing soundtrack sound quality of the OG Playstation (again, no need for live orchestra, just better quality synths), and an update to the retrospectively embarrassing translation of the original release.
2) Remake FFV and FFVI for 3DS: The two remakes they did for DS were very well loved, some even going so far as to call the DS version of FFIV the definitive version of the game, and whatever you thought of FFIII, it was basically just an enhanced version of the same game, and we were glad to have that little piece of history, finally. Meanwhile, FFVI is one of the most beloved games of all time. Make a no silliness remake of that for 3DS with better graphics and the improved sound quality the 3DS can provide, and you've got another classic on your hands.
3) Announce continuations of the Mana, SaGa, or Chrono series: Again, you could relegate these to the handheld departments as well and shit would be just fine. Easy money.
4) Just make Kingdom Hearts III already: Nomura is clearly tired of making the series, if you did this and let him make it a definitive finale, people would be fine, the game would make a ton of money, and Nomura could get around to finally finishing Versus XIII.
5) Buy fan translations of old ass games and sell them on the Nintendo store: I can't even begin listing how many games there are that fit this mold, and how easy all that quick cash is.
EDIT: 6) Put out Kingdom Hearts HD. Fuck, even I'd buy that and I haven't liked the series since the first one.
I mean this is easy shit.