I honestly don't think there exists a large enough fan base for "the things that made Legion work in the first place". It's just not a group/book that people care about anymore. DC is trying to make it work anyway... which I think is also foolish. Just stop publishing it for 5-10 years. See if people miss it. When someone has a compelling pitch for it, try it out again.
And the reason that not a lot of people don't care about the book anymore is because DC kept going away from what made the Legion work in the first place. It kept doing things like FYG (too dark) , or the Archie Legion (which failed in the end because it was too half-baked).
I liked the Threeboot, and thought in many ways it was going in the right directions, but a lot of hardline fans didn't.
So DC rebooted the "classic" team, but even that suffered from too many stops and starts, and being so half-baked in it's conception.