I honestly wonder how much money they could have made if they released again as a normal game.....
Especially when GOG is already using DOSBox in such a way that it's invisible to the gamer (unless he knows where to look!) I am sure some GOG customers have no idea they are playing a game in DOSBox full screen!
Many DOS games like Daggerfall could be sold that way.In fact, given the copious installation instructions given by Bethesda,it might have been easier to load it all in one exe, put a shortcut on the desktop and away you go!