Looking at the article from an unbiased position one could ask the question in 4 years at North Carolina, which of Butch Davis's assistants went on to be Coordinators or Head Coaches. The answer to this question would substantiate that what Butch did at Miami was not just a once in a life time lighting in a bottle event.
Go Canes
The problem with your thought here is that a team needs to have some success before coaches start getting offered jobs elsewhere. At UNC Davis was in year 4 and that team was about to blow up. They had 8 projected potential first rounders at one point and I believe 13 starters were suspended for x number of games, many of which for the whole season. If the NCAA issue didn't happen when it did, that team was going to be really good that year and his coaches would have been picked up again.
So then since Butch was given a letter by the NCAA saying he was cleared of being involved in the multitude of UNC violations, then those violations all fell on his assistant coaches whom he vetted and hired. The very coaches that would have supposedly moved on Coor/HC positions, if not for their various rule breaking actions. So then Butch picked players that were talented but dumb an crooked , and then compounded that by picking coaches that were also dumb because they not only got caught but were also flagrant with their rule breaking both from the NCAA standpoint an dealing with Agents.
An if you need a small refresher here is an article just about the UNC "Self Reported Academic Violations"
http://collegefootballtalk.nbcsports.com/2010/08/26/central-figure-in-latest-unc-issue-is-butch-davis-nanny/
Here is one a little more detailed
http://sports.espn.go.com/ncf/news/story?id=5501067
Soooooooo yeah I ask the question again, where are these UNC assistants today?
Go Canes