It would be interesting to get a successful business person to look at and attempt to formulate a business plan that could make a commercial slot track a viable business.
What are you calling "a commercial slot track"? I'm guessing you mean a raceway with '60s style eight-lane wooden tracks of any size.
Though there are very, very few of them, there are existing raceways that are viable businesses and generate sufficient income to support their owners.
The basics of retail business are reasonably well-established, Spencer, but the typical raceway owner doesn't follow them well, if at all. If there's a magical plan "that could make a commercial slot track a viable business" for an owner who doesn't advertise and/or promote (even online), doesn't keep his facility clean (especially the restrooms), has little or no stock, isn't open at the listed hours, doesn't have a exterior sign, is located in an area with no foot traffic, etc., I haven't seen it. It's a safe bet that the "very few" mentioned above do these things as a matter of course.
Your question infers you feel that all that's needed for a "more healthy" commercial raceway "industry" is a new raceway business model and I have to disagree.
Having a few more raceways on the list is always good, as there are so few venues where 1/24 wood track enthusiasts can race and play these days.
But having a few more tracks won't do anything for the hobby's invisibility to the general public and the miniscule level of participation.
Ballpark US numbers: 150 commercial raceways, averaging 25 active racers = 3,750. Averaging 50 active racers = 7,500. Averaging 100 active racers = 15,000.
As I've said, commercial slot racing can't be "fixed" from the bottom up. Only a top-down approach would have worked, and I think it's too late now.