How?
Simple, Lightning - I don't agree with you.
In my opinion, the movies did an excellent job of capturing these characters and portraying them in the movie universe. Were they 100% accurate? No. And I am certainly disappointed where some of the things didn't hit right. But I 100% disagree with you that the main trilogy got them wrong. I think the main trilogy got things mostly right, and in many ways, got them BETTER than the comics. Yea, Storm and Iceman kinda sucked. Yea, I hate that Cyclops got killed and Rogue took the cure. But that's really about all I can think of. Everything else was pretty close to spot on in my book.
A reboot won't get everything right, and will come with it's own flaws, and get it's own characters wrong, so I don't know why people are looking at a reboot as some sort of cure all incapable of ****ing anything up.
But, we've spent 13 years with this adaptation, and I see no reason to toss it aside for some NEW vision that's going to **** it's own stuff up and be just as wrong as the current version ever was.
I also don't see how someone can bash the main trilogy, but then turn around and champion the First Class version of the series, when X-Men: First Class got way more wrong in terms of comic book accuracy than probably the previous 4 movies -combined-.