I think he'll still be in the top 10 when he retires. Which is totally respectable. He's not stupid. He'll be able to tell if his ranking will fall drastically and will call it quits before that happens. But I agree he'll try to play till the Rio Olympics.
(: puǝıɹɟ ʎɯ sı ʇsı˥ ǝɹouƃI