That would be a good idea, but sadly, other patron-esque sites are becoming increasingly popular as an alternative and whether they would follow such a process as you suggest would be important. I doubt Patreon will risk it. If the devs and artists go to "greener pastures" Patreon would be a sinking ship.
Yeah, but the thing is, we've heard people say much the same about YouTube for years now, and yet we still have yet to see a really viable video hosting site pop up to replace it (the closest we've come is Twitch, but Twitch is kind of a different format and has its own host of problems). The same could be said for PayPal - it's been shit and has had major issues almost from the very moment it was created, yet it's still pretty much THE online payment service most people use (even if other, better alternatives do exist).
Once a site/service becomes large enough and mainstream enough, the mere inertia of its existence tends to make it the default option. After that point no matter how poorly they treat their audience or their content creators, viable competition isn't likely to arise and completely threaten their established dominance.