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there's an echo

perhaps this is what Fro refers to?

Let me rephrase that to something less hyperbolic.  He didn't leave them in near as good of shape as he presided over for a while.  His last UF team was not pretty.  Wasn't even the record, which was 4-4 in conference....it's how they looked on the field.  Then suddenly he had to spend more time with his family, for health reasons. 
....after which he took the Ohio State job in a year. 

It took a minute for Florida to have "Florida" guys on the field again. 

I don't think we're too far apart, despite arguing opposing sides of the topic.
UM showed in 2007 that he can't just magically win every game with talent - that talent had to mature and gain experience.
Staring out at UF, he was an immediate upgrade in coaching with an already-talented roster.  Zook could recruit!  After that 2007 talent matured, 08-09 went 26-2, then Tebow & Co. leave.  That 2011 season under UM wasn't surprising for Gators fans.  UM is a great HC, but he's not magical.  He'd have to reload the roster and if he had stayed, I'm certain those upper-echelon classes would have peaked with 12-13 win seasons. 
But he left, and a lesser HC took his place.  The players didn't become less talented, they just lacked the combination of great talent + great coaching. 

This might be unpopular here, but OSU post-UM has succeeded for one of two reasons:
1 - UM improved his ability to keep the ship sailing with his absence, which would include numerous aspects, OR
2 - OSU doesn't face an LSU, Georgia, Alabama, Auburn circa 2010s that Florida did, post-UM

I'm certain the answer is 1 & 2.  Ryan Day still hasn't lost a conference game yet.  Says a lot for OSU....doesn't say a lot for the B1G.

Muschamp was just bizarre as a HC.  I get that a defensive guy is going to focus on the defense and all that, but under him, the offense was designed to service the defense.  We don't want to pass, ever.  If we pass, NO TURNOVERS, even if it means never throwing downfield.  Getting a few first downs and chewing some clock is better than a quick score.

He actively sabbotaged his own offense just to get his defense some secondary boosts.  

In Gville, idk.
But personally, I find the national click-bait vague outlets' stories silly.  They're so radical.
Is Mullen's current record and results good enough?  No.
But I think there's an obvious fix for the issue:  hire better recruiters. 

Mullen seems to have the same apathy/arrogance about wooing 18 year old, 5* kids.  Similar to Spurrier.  But Mullen is no Spurrier. 

Dan Mullens Florida future probably not at immediate risk after recruiting controversy (247sports.com)

Duh, I'm amused this gets any attention really, but it's a sign of how controversies stimulate clicks.

Mullen won't be fired this year.  They do need to show some progress, finishing 9-4 would help, and next year ...

Akron fired coach Tom Arth on Thursday, a day after the Zips fell to 2-7 on the season.

Arth went just 3-24 in two-plus seasons at the school. Associate head coach and inside linebackers coach Oscar Rodriguez will serve as interim coach for the final three games.

https://twitter.com/ChrisLongKSTP/status/1455962452861112324?s=20

I wish someone would start a rumor to get my employer to increase my salary 12 fold