Sucks about the oak tree thing, suppose everyone just wants to be hopeful lol.
I agree with ya timbogrow, if you cant fight the bug on a manageable scale, scale down. And it looks like that scale goes all the way down to each individual tree cause spraying the groves doesn't do jack. But thats likely never going to happen, and citrus greening is in like 7+ states and US territories, so its never going away no matter how strictly they regulate imports in the state.
Dont forget to give credit to every big box store selling the citrus trees like candy. Its nice to get a good deal on some things, but like so many people have no idea what theyre getting into and just buy a citrus tree and plant it without background research. Probably hard for people in this forum to grasp that concept haha. Seriously though, I have met so many people that have citrus trees around here that dont amend soil, fertilize, or spray ever, just cause Florida = Oranges.
If its never going away, I say why not try on a small scale. Pick from the plants mentioned in this thread and avoid those recommended against. Keep it sheltered, netted, and overall healthy and in a few years maybe itll be worth it. Or maybe it wont. Your choice!