Here's what I will say about Beaty and this has been my position for awhile now. Regardless of W-L record, he needs 5 years for no other reason than to allow his successor a chance at success.
We have less than 10 seniors this year, keep Beaty and allow him this recruiting class which should bring the scholarship numbers back into line. If there's not significant W-L progress next year, then you fire Zenger in October, hire a new AD immediately and let him clean house on the staff and bring in his choice.
I also disagree with @HighEliteMajor about changing systems. I'm fine with abandoning the Air Raid itself, but some variation of the Spread offense is what KU needs to be successful.
The principle behind the spread offense is to create mismatches and 1 on 1 coverages in the secondary. When you spread the field with 4 receivers, that can open up the running game as well, especially if the QB is mobile which brings the zone read into play as well.
If you go from something like the spread to an option like the academies or GT runs, that will require completely rebuilding the roster again for players who function in that system which would take a full5 recruiting cycle to do so which means another 4-5 years of transitioning and frustration. By bringing in another spread coach, there would be tweaks to the system, but the overall concepts are the same and the learning curve is much less because of that.
Another question to ask is about the next coach is what is the goal. Is it someone like Matt Campbell who would likely leave in a heartbeat for a new as soon as it's offered, or on an unknown who is more likely to stay if he has success, but is a much higher risk of failure as well?
My personal plan would be give Beaty one more year to show something because that 1 year will keep KU from falling way behind on scholarships again which sets the next coach up for a better chance of success early on. At least that's my thought on the matter.