Why End HoM?
From the heroes point of view why should they have fought to restore the normal 616 universe. Almost all had what they had always wanted and deserved, there was not much wrong with this world except for the mutant racism and the problems, imo, would've been greatly less difficult to fight and stop. So, why fight to change it back?
Captain America had the life he wanted except for the world not turning out the way he wanted but, that the same as the 616 world.
Spiderman had the life he always wanted he was rich famous, Gwen was alive and his wife, he had a son and most of all Ben was alive. With the exception of the being the Goblin CRAP he got what he so rightly deserves. Even after the Goblin BS he was finally able to be happy.
I don't want to go hero by hero but if they had only made a very few changes to the world it seems to me they would have had the world they are trying to create. I am not saying that I wanted the HoM to continue, I love the 616 verse way to much, but aside from it being a story where they have to change things back, why would THEY have really wanted the old life back?