Part of the reason Waynedale has dropped off the face of the earth in football is partially because they did give the job to their HOF wrestling coach for a long time. They couldn't find a candidate and took the "easy" path giving it to him. While it passed the initial smell test ("he's a great coach!") it soured quickly because his focus was still all about wrestling (Can't blame a guy for focusing on his passion) and not building a football program.
Like with any "why aren't they as good as they used to be?" question - majority of the time it comes to administrations that look at football the same way they do every other sport & club. Not saying that's right or wrong, it just is. Have heard good things about the new coach, but he's young and digging out of a hole many others have dug for him.
As for why baseball is so good - they have a Latin American (Honduran?) kid pitching for them that is LIGHTS OUT good. This past year they graduated another kid who I think went to OU on baseball scholarship. Hard to beat a 1/2 combo like that at the small high school level.