As an aside, it's interesting to note that there is a hypothesis that one reason why humans, and most other species, do not regrow limbs is precisely as a means of protecting against cancer. The few species that are able to regenerate limbs usually have to activate the regeneration, and that activation involves turning on an immune surveillance system that seeks out potentially cancerous cells and kill them efficiently.

I don't think GP was making any predictions, the comment was making an analogy to overly general disease specifications.