I'll give him six months.
Why? People who 'quit' generally fade away without any announcements. Logging back in will also be a clue!
I'm sure he feels this way right now but the temptation to sample fresh meat will be far too much, down the line, IMO
Punting, the excitement and variety are deeply ingrained. He'll get bored and be back. Wish him well, of course. It starts with..well, just one...and then...