Heh.
Well...that lets out the Guardians. And there are plenty of simply fabulous Earth heroes, like Superman or Wonder Woman, but they aren't Lanterns, and I would assume that it is probably more inclined to want a Lantern involved.
There is Deadman of course, who is in possession of the only White Ring, and who seems to be communicating with some sort of entity, which zaps him all over the place. On the other hand, he's invisible, and rather cranky at the moment, so who knows? And if he DID lift it, what on earth would he DO with it?
It's possible that only someone who has experienced ALL of the various emotions embodied by the various Corps would be worthy. And sadly for him, that's not Hal Jordan.
Could be Guy though.
Because that would just crack me up. Kyle would probably be a decent choice as well. It would also be a hoot if it was John. Or B'dge. And I'm sure that Larfleeze would love to have a go at it. Maybe they could trade him the White Lantern for poor Sayd.
I really don't know where Geoff Johns is going to be going with this whole premise, but I can't wait to find out.