For the specialist audience, Chrono Trigger. But it never had FFVII's reach in its own day, and I think it's clear that Square/Enix has exhibited a decades-long pattern of treating that game far less reverently than the players. It has aged well in its current form despite the mess of availability/quality over the disparate ports, however. From the JRPG library, Xenogears needs it more, but its reach would be even smaller and it didn't surprise me to hear a little while ago that the business case for it had apparently already been considered and rejected. (Unless I'm thinking of Xenosaga.)
Warcraft I and II arguably needed this far more than the coat of paint being applied to III. They could use a top-down reimagining—artwork, interfaces, mechanics, maps, everything—and without any thriving competitive scenes or mod communities to speak of, there is no reason whatsoever to remain beholden to the limitations of the original UI. Interoperability or mechanical faithfulness don't need to be accommodated, but there is a definite opening for the lore and characters to be made accessible again.
I don't see the argument for OoT at all, but then maybe a substantial reimagining will finally be the thing to convince me that OoT was anything more than a solid and significant starting point for far better games. I'd rather see Zelda-related resources directed elsewhere, particularly if we're getting that style of dungeon back.
Zelda II is overdue, though of course it wouldn't make nearly as big a splash even compared to Samus Returns or Link's Awakening, never mind one of the 3D games. It deserves a revisit more than anything else from one of the headline Nintendo series, though I'll happily take Genealogy of the Holy War too.
All comparatively niche, though. I don't think anything is positioned to make a bigger splash than FFVII. As far as that weird transitional early-3D era goes, even GoldenEye has already been tried. Maybe in a few years we'll see something like Rockstar revisiting GTA III and Vice City, because that's probably the one era of GTA that would best support this treatment in terms of potential, nostalgia value, and need; that's the biggest thing I can think of in terms of the audience it would excite.