I mean you could do it, but you'd upset a huge portion of the community, I'm saying that if this had been done long ago, it'd work a lot better.
As for who would own it, no one needs to, let the guild own the gp, then there's a leader of the guild, who may lead the guild and have payed for it, but doesn't technically own it, as anyone can lead the guild if that person leaves. Basically gp would turn into less of just a point system, and more of just proving the legacy behind that guild.