The simplest explanation is not always the most fun. Yes, you could say a school of mutants has always existed in West Chester, NY, but chose not to engage in any of the world threatening struggles– boring, (and also, very unlike the X-Men to ignore such threats). And the Baxter Building has been in the Microverse the whole time? –not buying it.
Captain Marvel by Artgem (aka Stanley Lau)
You could solve it easily with time travel, via the Infinity Gauntlet, with Captain Marvel resetting the entire universe, but one of things is not like the others– enter the XMen in an end credit trailer to the deafening screams of Marvel fans (I would be one of them), as Stan Lee begins reading a copy of the Daily Bugle with Fantastic Four on the front page. This is certainly scifi plausible and would be acceptable, but I have another theory..
..during the final battle with Thanos, Scarlet Witch alters reality with her magic, destroying the Infinity Stones, ceasing Thanos to have ever existed, but also inadvertently alters the reality of the universe. The previously vaporized superheroes return and BOOM the XMen now exist, and have always existed according to everyone, except Wanda. Wolverine, Rogue and SpiderWoman (Jessica Drew) are standing beside their teammates, the Avengers, The Fantastic Four can be seen far away atop the Baxter Building, and far, far away, the Silver Surfer makes a deal with Galactus to save Zenn-la.
in 1986, we witnessed one of the best comic book series of all time, “The Dark Knight Returns.” it is this very comic that Zack Snyder has based the upcoming superhero film, ‘Batman v Superman : Dawn of Justice.’ as a fan, in no way, could i ever pick one comic book and label it as ‘the best of all time,’ but i can clearly remember how awesome it felt to read a great story, with amazing artwork, and ‘The Dark Knight Returns’ immediately comes to mind. three of my top 10 comic books are The Dark Knight Returns, Secret Invasion and Blackest Knight; (you will have to follow me for my complete list, and for a more comprehensive list, follow @Jaiwiin; the most knowledgeable comic book expert i have ever met). Tim Burton, a huge fan of Frank Miller’s comic book work, reinvented the screen depiction of Batman based on ‘The Dark Knight Returns,’ with his first Dark Knight film, ‘Batman’ (1989). in ‘The Dark Knight Returns,’ Frank Miller delivered such a great story & reinvented Batman into a grittier, darker version. this new version of Batman has influenced his comic role and even all superheroes. today, when a superhero in a comic book, tv show or movie is reinvention in a darker, grittier version, it is known as “Batman-ing;” eg, the ‘Batmaning’ of Arrow or ‘Daredevil.’ underneath every great comic book, tv show or movie, is a great story; Frank Miller has delivered that with the Dark Knight. in 2001, we saw a great sequel to this great series, “The Dark Knight Strikes Again,” and now, coming this fall, in 2015, we shall see the highly anticipated threequel, “The Dark Knight III : The Master Race.” Brian Azzarello (comic book writer for: Joker, Wonder Woman & 100 Bullets) will join Frank Miller for this Dark Knight series; a comicbook artist has not yet been announced.
“Batman remains my favorite comic book hero and a sequel to Dark Knight is going to be daunting,” said Miller, “but we’ll do our best.”