I don't even think he'll be nerfed. For the tournament he's only the 9th most picked and he has the third worst win percentage among the 17 heroes with more than 20 picks.
He's just a flashy hero and trending, so he's attracting a lot of attention. His biggest problem is that he's dead weight outside the chronosphere, so there's a lot of pressure to get it right on the money. Since it's the only thing that really makes him worthwhile, it pushes a lot of teams to go aghs/refresher and bkb on him before anything else, which destroys his damage dealing potential and his ability to easily pick off heroes.
I think he's in a good place. His pick rate will go down as the trends shift elsewhere, but he's still going to have a place in the meta which he never had before his buffs. If anyone is going to see significant nerfing its Lycan, Doom, and Tinker.