The sad thing is that Fall of X wasn't quick at all.
They had plenty of time to wrap everything up in a satisfying way. They just didn't.
They chose the most convoluted (RoPoX) and underwhelming (FoHoX) ways possible. Not to say anything about the minis that should either have been used to end their ongoings (Forever/Magneto) or didn't add much to the overall narrative at all (Iceman/Realm of X etc).