I dunno how likely it is. But I don't see why it might not happen.
16 games. 100 catches is 6.25 per game.
It seems pretty clear that Goff is STRONGLY inclined to look for Kupp for possession receptions. I don't really see why he couldn't catch 7 a game. He caught, what, 6 in 1 PS half of a game?
I suppose people will start game planning for him. But, they do have to be concerned with Sammy and the running game. And McVay can run an offense ...
I dunno. If hew stays healthy, he'll catch a lot of balls. I think 100 might be possible.