It's not the scheme so much as just how poor the talent is. Our defensive front 7 is putrid. I can't think of a single defensive player in our front 7 who causes an offensive coordinator any concern when building their game plan.
Changing schemes is not likely to lead to better results. We need better talent and I am not optimistic that will happen.
So if the talent isn't there, why insist on running a Defensive scheme that requires outstanding talent? If you can't control the LOS and get a pass rush, as you indicate, what would make any sane coach think he can run Cover 1 and Cover Zero pass defense schemes?