Who knows, he might come back, he would need to be on a HBK/Taker schedule though for him to seriously think about it.
I'd love to see him back, 6 months ago this would have sounded crazy but you never know after his illness, he has a serious weakness now, he might not be the unstoppable machine in UFC he was percieved to be, at least in Wrestling while he wont be able to guarantee his safety, he can at least take precautions to protect himself, where as in UFC he will need to defend himself for his life
It could happen