They would need to ditch that horrible, ugly, Unreal Engine 3 for something a little more modern. (Frostbite or Unreal Engine 4 anyone?)
I did enjoy the trilogy on the PC with high-resolution texture mods and injected shader effects and at 60fps 1440P. (7680x1440 for Mass Effect 3) but it was still a game that graphically made my eyes bleed.
If done right the game could benefit greatly from an overhaul and I wouldn't complain about a PC re-release either.

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