My issue with the idea of "If the Bills would have drafted XYZ, we'd have made the playoffs!" is assuming we'd develop the QB just as well. Wilson, Tannehill, Dalton, etc would have flamed out here because we've had TERRIBLE coaching staffs over the years, especially with how we've developed QBs.
I think the current staff is better for developing QBs. Hell, I even see improvements from EJ (yes even with the pants shitting for 5 mins against Jax), and Taylor is certainly better than anyone would have expected. But in the past? I doubt it would have mattered unless we drafted a Peyton Manning.