So many angles to this dilemma but I liken it to the drive-in theater you used to visit as a teenager. Everyone is sad when they tear it down and build apartments, but ask them the last time they went and they can't recall... but they keep meaning to go
The money simply wasn't there and it is unrealistic and ridiculous to assume the Miller family should continue too subsidize the track when the end of the tunnel was nowhere in sight. I don't think the prison had anything to do with the decision and the LHM Group has indicated the same. You can listen to their extended explanation here:
https://audioboom.com/boos/3164816-why-is-miller-motorsports-park-closing
Let's face it, Sunday sporting events don't bring in box office results in Utah and the track was grossly overbuilt for the Utah market even if Sunday sales were on par with Saturday's which they were not by a long shot. They invested heavy on a chance, continued to plug holes and finally said enough is enough. I don't blame them one bit for stopping the hemorrhaging.
Had the track been in SL County as originally inspired (thwarted by environmental and political concerns) I think things might have ended differently. Had they built a $7M-50M site perhaps it could have stayed on course? In the end you have a $125M facility that didn't cover it's spread so it was an unwise decision to continue. I have no doubt another company (perhaps a race track management firm?) will step in and run all or part of the track, too much resource there to be had at a discount. For those in team garages and employees, the only surprise if any, is if any of them are actually surprised. Writing has been on the wall and I'm sure employees will have an opportunity to move within the company as they have done with other closures.
You can read much about the track's issues and money sink in Larry H Miller's own book "Driven" (written in 2009 fwiw). Larry owns up to overbuilding the track, calling it the "ugly stepchild for the Miller Group", losing $2M a year then (presumably much more now as things get older, events dwindle, etc). He knew early on it wasn't going to work in Utah, the motorsports craze just didn't land here.
As for the strength of the LHM Group. I can assure you they are stronger than ever, bigger than ever and growing. New dealership acquisitions, new theater construction, nearly double the number of employees and their real estate portfolio is growing. They still offer a great value to the community in terms of both economic means and philanthropic means. Doesn't mean I'm not sad to see the track go, I can assure you I've spent more days there then most... but I can't expect anyone to subsidize my hobbies any more than I subsidize theirs.
Let's keep our fingers crossed the county can find a suitable tenant and said tenant can make a go of it.