Like a staight to DVD release? So they can have an unlimited time-frame, and make it whatever they want with an R rating?
If so I would not be upset.
If I did not like it I would just not view it.
Saying it would ruin anything, is like saying that Kenner's toy line ruined the Aliens.
Clearly they had no bearing on further films, so I think an animated, for adults movie, or even several would be just fine.