Well, to name one... do you think Aaron Rodgers, or the GREAT ONE himself, Emperor Brady, would fare well behind this O line? Or how about Mahomes for that matter?
I can't see any quarterback thriving behind this O line and nonexistent run game. Moreover, the league has seen plenty of game film and can at least defend against our passing game - especially if that is all they have to worry about.
To be fair, Mahomes could probably put this ragtag of an offense on his shoulders, and he and Kupp could win some low-scoring games with it. If you watched the good football game on Sunday night, you saw that even the uber-playmaker Mahomes needed some help in addition to displaying his brilliance in the win. He has some good tools on the O line and a passable running game. He'd lack those things with the Rams.