He's not getting fired tomorrow or before the end of this year, so the buyout isn't 5 million. It drops to 3.4 million after Jan 1 2017.
As far as paying for it, we've sure got the extra seats right now, so bring in a coach who can put an exciting offense on the field and you'll get the fanbase back eventually. This isn't rocket science. Plenty of schools at all levels can figure out how to put an exciting offense on the field.
If Benedict/Herbst think he should be fired on Nov. 27, do you really think they're going to wait 36 days and let Diaco twist in the wind?