I do think the quality of the WR talent matters but to say we've never seen a great QB cause a WR to emerge is absurd.
Wes Welker immediately doubled his output from Miami to NE and he doubled it for 3 straight years.
I also think the Bills change from Diggs, Gabe and Knox to Kincaid, Shakir and whoever emerges is rare. However to think Allen isn't going to cause a couple receivers to have great years relatively, IMO, is nuts.