Of course the avengers had their numbers reduced, they're sick because of a plague caused by the mutants on purpose and they're rendered sterile, how terrible for the avengers... And the evil mutants had repopulated their race, had amazing technology and didn't give two craps about the poor soon to be extinguished avengers... How sad
Now back to reality
This is the help the inhumans have given to the X men, they don't care about anything but themselves same way the avengers or the ultimates don't have any problems with letting a giant toxic cloud roam the earth because mutant lives don't matter to them, never did and never will. That's why people sided with Cyclops before, that's why Magneto is more of a hero, that's why Emma is considered a heroine now... Because passivity got the mutants nowhere and only got them killed, those who decided to take action where vilified in universe and those who did nothing reap the rewards and vilified those people when they didn't do anything themselves