Oh, he's going to be a permanent resident. I went out and bought him a nice enclosure with a wheel and everything. I even got an exercise ball so he can run around the floor at night after I put my dog up.
He hasn't gotten off the wheel since I put him in there, and it hit me that this may be the first time in his life he's actually been able to run or have any space to himself. A bit sad, but he seems pretty happy right now. I think he has some degree of understanding that his life just went from being pretty terrible to pretty awesome.