An ongoing game league doesn't sound like the kind of thing Kickstarter would be best for. Kickstarter says right on their site that they're there for funding specific projects with finite end products, whether that end is a book or an invention or a concert tour or whatever. Since you intend for the league to go on as long as possible (or, at least, I think that's what you're saying?), the project would probably be rejected because it's not finite. I'm also not sure they'd allow you to use the site to fund a league based on copyrighted material; Kickstarter definitely emphasizes original creative projects.
There are other crowdfunding sites that may have different rules, so those would be worth looking into.
Another possibility might be to start by making some sort of t-shirts (for example), and have that be the thing you crowd-fund, and then use the profit from selling the shirts to help fund the league?