That's a hard question to answer, because usually this kind of thing doesn't happen at all. Even with some of the worst remasters the company usually has the integrity and foresight to keep the original version readily available. the FPS game XIII just had an absolutely horrible remake, but the original game could just as easily be bought and played legally.I am not sure what happened to other shitty remakes as comparison. Did the community take over? I remember from Gothic III that the community had to create patches and I think they even got access to the source code since it was so bugged and the publisher did not want to pay the developers anymore.
Keeping the original version up is something even the scummiest devs know to do, especially when the new version doubles the system requirements and bloats the filesize x10.