Check out Todd Stottlemyre, Dave Stewart and Jack Morris, 3/5ths of the starting rotation on the 1993 team. They combined to be barely above replacement level. So teams have won with Happ and Hendricks-like expected performances before.
I know what you mean but
"History also shows doing nothing almost guarantees another disappointing season and empty seats."
Sounds like you were just trying to be a pain in the ass rather than come up with a real point.