I know I'm gonna get it from the

pencil-dicks on this, but one
remotely-possible scenario, where I can see Chris permanently leaving 14BC on his own, is if he were indoctrinated into some kind of commune group or cult. Yeah yeah,

Fuck you. Bear with me on this, a second...
He's really suggestible, right? We all know how lonely he is. I think if a group of people promised that they would love him unconditionally and care for him (possibly even include him in orgies or wife shares), I can see Chris jumping on board without considering the potential risks. That part I don't see as unlikely at all... Lots of less-naive and more-intelligent people get sucked into such groups on a daily basis.
The unlikely part is that I don't see any such group viewing Chris as being a good member (he's an angry and lazy manchild with serious problems) or a good mark (he isn't worth much, and he can't work hard). Only the real zealots who think they are saving him, would ever consider taking on Chris. What makes it almost impossible is that you have to go out of your way to find these groups, and Chris can't even be bothered to find the bathroom in time not to make boom boom in his Monster High panties. Until cults start combing McDonald's for filthy obese marks, Chris is probably safe.
If Chris leaves 14BC, it's almost definitely because some external force is making him - either the house becomes uninhabitable, he loses possession of the house, a court of law orders him to live somewhere else, a court of law incarcerates him, or someone else who Chris believes has authority over him is able to pressure him into moving. Another remote chance is if a better opportunity comes up, and Chris is intelligent enough to see the benefits, but I think that's even more-remote than the cult possibility. I don't see a rich patron saint stepping up to fund it (there's no way the state of federal government would fund it, unless Chris suffers severe brain damage), and we all know Chris' tendency to throw offers of help in other peoples' faces because he doesn't want help - he wants a gift-wrapped life.
Okay, another
really stupid possibility for Chris leaving 14BC for good crossed my mind...
I can see Chris going out one day for Q-sands and Fanta, coming back, and realizing he left his key on a table inside. Chris being Chris never considers the possibility of breaking in, or calling a locksmith, and lives the rest of his life in one of the cars. Yeah, I know how stupid that sounds. But, dig deep down and ask your inner cynic... No matter how far-fetched, is
anything too stupid for Christian Weston Chandler?