I wrote my thesis on this issue. Tom sat on my committee and Mike Young was nice enough to have some candid conversations about it.
Just because a course is useless doesn't mean it'll be the course that closes, though. As Tom states, local golf courses would at least control their fate if they joined forces and decided for themselves how many can exist, which one(s) needed to go, and how to absorb the debt/reallocate assets and employees to other clubs, etc. It's complicated, but not impossible.
My fear is small golf courses in urban areas that could potentially provide good social, economic, sustainable benefits are in the most danger of closure. If I could rewrite my thesis I would've focused more on that. Sunset Golf Course right in my backyard just closed and it could've remained open if the developers had seen its potential. Imagine if Candler Park suffers the same fate? Or if Winter Park had succumbed to that.
Even if Sunset couldn't have remained the 9-hole executive course it was, it couldve become a cool par 3 course without much investment (roughly half the course was located in flood plain where the developer couldn't touch, anyway, and we went to them with an idea for a par 3 course that would've cost peanuts to execute... would've been a unique asset for the apartments they were about to build!). And for some clubs, maybe it makes sense to sell part of the land and go from 18 to 9, or from 18 to 12, or from an executive course to a par 3 course, etc. Use that money to pay off debt, improve the golf course, etc.