It's even more illogical to wait on a proven coach. Saban at Alabama has probably been the only homerun hire in the last 20 years in the SEC. Half of the current SEC coaches had no HC coaching experience when hired.
Really?
Urban Meyer comes from Utah to Florida and wins two National Championships. Homerun hire. Discounting "health" issues, any fan would be happy with that record.
Bobby Petrino bails on the Atlanta Falcons to coach Arkansas and turns them into a legitimate contender. Minus some silly personal indiscretions, that was a very solid hire, if not a home run.
Steve Spurrier comes out of forced retirement from the NFL to take the South Carolina head coach position. Traditional mid-to-bottom tier SEC east team is now consistently spending time in the top 10 nationally. Home run.
Previous Head Coaching experience before current job:
Saban - Toledo, Michigan State, LSU, Miami (NFL)
Dooley - Louisiana Tech
Smith - Idaho, Utah State, Louisville, Michigan State
Freeze - Lambuth University, Arkansas State
Sumlin - Houston
Spurrier - Duke, Florida, Washington (NFL)
Pinkel - Toledo
Phillips - none
Mullen - none
Richt - none
Franklin - none
Muschamp - none
Miles - Oklahoma State
Chizik - Iowa State
So 5 of 14 or 35% had no previous head coaching experience. I'll grant that your were correct in that the SEC does have a good number of coaches with minimal experience and were probably using hyperbole in saying half.
Both hiring options have their merits. After some growing pains, Muschamp is improving. Mullen is doing wonders at MS State. Franklin has performed above expectations at Vandy. Richt is, well, handsome Fulmer without a championship. Phillips has returned Kentucky to its traditional place in the cellar of the east.
Experience isn't the end-all-be-all, but it definitely can help. Saban and Spurrier need no further discussion. Smith has been a disaster at Arkansas and was a mixed bag everywhere he's been. Sumlin and Freeze both have only had short head coaching careers so far, but both seem to be winners everywhere they go. Miles didn't set the world on fire at OK St, but with the talent and fertile recruiting grounds near LSU, has been solid. Chizik proved that Tuberville had good players and needed a good $180K rent-a-QB to turn it into gold. Now he looks to be performing just as well at Auburn as he had at Iowa State.
I agree somewhat with the OP that it doesn't make much sense to dump our HC for an unproven coach. If we can't bring in a proven winner, see what Dooley can do with his senior class and a defense that should understand how to execute the 3-4 system properly. If Dooley falls short of expectations then, by all means, show him the door when his buyout is smaller, allowing us increased spending potential to get a proven guy or at least a better up and coming coordinator that shows a lot of promise.