I mean look, it could just be a recruiting issue. You're at a distinct advantage if you have good nearby talent. If you look at the teams that have gotten better, they all have local talent (Cornell, OSU, PSU). Look at the teams that have gotten worse from where they were 10-15 years ago: Iowa, ISU, Okie State, Minny.
In the case of PSU, not only did they have the advantage of kicking off their run with the dual-team thing (yes I know Brands had that benefit), but they also are in PA, which is the best state bar none for recruiting (that in-state tuition helps) and they are close to NJ and NY, two great wrestling states.
Maybe the coaching won't make a lick of difference. Maybe it's just a recruiting issue at the moment. I mean, it was important enough to allow Cael to stab his alma mater in the back, so take that for what it's worth.