Nah, nothing will happen like that. On the whole post Cobra doesn't mentioned he want to sell the domain. As he said he want to retire, although I don't know the real reason behind of this but I believe he will take an appropriate decision. But the real concern is about trust.
He didn't mention selling it but it doesn't automatically mean that it's out of the picture. I'm not doubting Cobra as I really don't know him but he's quite reputable as far as I know, but let's not forget that he's using a pseudonym and that his reputation wouldn't matter that much in the end as he's planning on retiring the pseudonym anyway.