Interesting that you put it this way.Though House of M happened 15 years ago many mutants lost their birthgiven powers and were made human due to this event.
How many mutants actually had their powers since birth? It seems most cases, mutants would gain their powers in their teens, giving them anywhere from 12 to 19 years of being "human."
Then they get powers and all of a sudden they aren't human anymore? Suddenly being human is a bad thing? They don't consider themselves humans (who just happen to have powers) anymore?
There's just something wrong about that way of thinking to me, but it seems to be one that's been embraced by the X-men in recent years.