I really wish they would have made the original concept of the Raiden game where he was forced to turn into a cyborg. And possibly remake the original metal gear games with rookie solid snake. I wanted to see more of his friendship with Grey Fox and fighting actual child soldiers.
While it would be cool, the problem is that MG and MG2 are very similar in structure to the point MG2 feels like an enhanced remake by itself and then MGS feels likes an enhanced remake of that. And then in MGS2 he made the whole thing explicit and turned into something really meta(
Big Shell was all a recreation of Shadow Moses ).
It's one of the weird things that playing the series back to back in a short time makes you realize.
So if you were to remake Metal Gear and Metal Gear 2, you've have to do some clever adaptation to NOT make them feel like you were just playing the same game twice. Also you'd have to make sure it didn't just feel like playing Metal Gear Solid again. Arguably, you'd combine elements from MG1 and MG2(mostly MG2) and call it "Metal Gear Zero" or "Metal Gear Origins" or whatever 5 rotating names marketing picked out of a hat that day before taking a 9 am lunch. I'm pretty sure nobody would care as long as it were done right. Somehow a doubt there's a massive group of Metal Gear Purists who would be really mad if the two games most people never played got turned into one game, especially considering Metal Gear has a plot you can describe in a paragraph and no characters/dialogue worth mentioning(other then the bits where Big Boss starts fucking with Snake over the radio).
Of course, the big wrinkle in this is that Komani would be doing this and that's the company who had the FOX engine in hand at the end of MGSV, and what did they do with it, a shitty zombie game nobody fucking liked with "Metal Gear" Slapped on it. I mean, Christ, if that isn't a waste of resources I don't know what is.
A lot of the Sega Genesis games on GOG are emulation based. So GOG should not have any qualms doing the same thing for metal gear.
Nintendo had MSX2 emulated games on it's Wii Virtual console, apparently. It was Japan only but apparently it's not that hard to do.