Some of the best situations for a new coach to walk into are after a coach who recruited well but didn't get on field results is let go after a pretty fair shake of it (i.e, not unusually early for a coach to be let go; i.e, after 4 years or so). There's not that much pressure because the school was patient to the last guy, and the results were maybe not that stellar. There's a lot in the cupboard and given recent results they're likely to be receptive to a new staff, rather than aggrieved about the firing of the previous one.
I don't think it's as easy as "right coach, recruiting will work itself out." Fire too early and you make it hard on the next coach. Doubly so when you sacrifice a good recruiting class, the sort that is rare to come by. The new HC and whatever OL coach, coordinators, etc, are going to be feeling the same heat in a few years, and we'll be playing this "but look at the talent" versus "oh yeah, if he's such a good coach, how long does it take" game ad infinitum.
So yeah, if you think we need to make a change from Riley at the top, fine. The HC sets the tone and Nebraska lost to Arkansas State. That's pretty extreme. But we can't keep these standards for the coordinators, position coaches, etc, forever. Or we'll never be happy with any of them -- and pay the price for the constant churn there that results.