I'd say the lack of a running game and underachieving receivers has been more limiting than McCown.
But you can change out the QB more easily than any of those other problems. It's a long shot frankly, but maybe Manziel's legs and propensity to look for the long ball when flushed out will help. I wouldn't bet on it, but worst case scenario is we still lose while figuring out the QB situation.
2017 Draft picks:Left: #145, #175, #181, #185, #188
2018 Draft picks: Extra picks - a 1st (Texans), two in 2nd (Eagles & Texans), a 4th (Panthers/A.Lee), & a 6th (Steelers/Gilbert) - 12 total
Philly trade result: C. Coleman, Kizer, Peppers, S. Coleman, Kessler, Drango, Kindred, R. Louis, Payton, 2018 1st rnd (Texans) & 2018 2nd rnd (Eagles)
Draft: 4/28-30, Rookie MiniCamp: 5/12-14, OTA's: 5/23-6/8, Veteran MiniCamp: 6/13-15