If you're right and he does quit after this year, he'll wait until the right time - when the announcement and parades, and speeches, and special events on TV, and docmentary series, and nauseatingly endless inteviews on thalk shows, and splashy introduction of new product lines he's endorsing, and the nationwide opening of Tommy's Avocado Ice Cream stands will all coincide.
And that'll probably be in direct competition with the playoffs and the Super Bowl. To siphon attention off those goings-on and onto himself. Just like his last retirement. Before he comes back. Again.