I would think that an Amiga version would be fairly easy (relatively speaking, of course!!!). Essentially Megaman X is multi-scrolling platformer, albeit with shooting elements, which the Amiga is perfectly set up for, due to its display mechanics.
Look at similar games, such as Assassin, Superfrog, Turrican, etc. They all shove sizeable maps around in 8 directions and have enemy sprites and what-have-you going on. Surely a similar approach could be taken for Megaman X?
I will just state that I may be being a bit upbeat and overly-positive about such a project, as I would definitely like to see it happen!!