The most boring (and somewhat rational) answer I can think is that
1. He will continue to receive his disability benefits, no matter what. SSDI benefits are notorious for being hard to lose and easy to get back - pretty much, once you are in the system, you are in it for life (with the exception of temporary SSD of course)
2. I assume the house will be sold, no matter what. Barb will have to have her debts covered somehow, and that can only be done by selling the house seeing as the Chandlers seem to own nothing else of worth.
3. Chris will either end up having to get an apartment of his own, or having to live in an assisted living situation - dorm style, with catered meals, living with other people who have disabilities, and having very little control over his own money. I imagine getting an apartment for Chris would be extremely hard, as any sort of credit check.......

4. Probably a sort of fizzling out of drama and interesting shit as Chris goes deeper and deeper into depression as he slowly loses more and more money and control over his own life. Maybe there might be whiffs of Cherokee prostitutes and Chris taking after Barb and being in court over debt, but I really doubt at that point in life he would be willing (or able to) do anything other than buy his shitty toys and vidya, and

I agree with everyone else who says it will probably be the end of the saga. Barb is, after all, the anchor to the

. I wish as much as everyone we could have the saga of Mean Christine, the most evil homeless transautist prostitute in Charlottesville or something, but I doubt that this thing will end with anything but a whimper.
To be honest, the thing that bothers me most is what will happen to the pets.

To whomever has to deal with the logistic of the combined hoard of Chris and Barb, I feel so fucking bad for your poor, poor soul.