There's a difference between reading back issues over and over again and seeing new comics on the shelf with your favorite characters every month.. and everybody knows it. That argument doesn't hold up.
I'd much rather read a resurrected Jean, revolutionist Cyclops, Apocalypse Angel, Mad Scientist Beast, and an Iceman who's taken steps toward higher self-actualization than a replacement group of younger versions just so writers aren't tied to any of their histories.