With sympathy to your appeal that 100% closures will force us to reckon with the problem, I suspect it'd only lead to missing the forest for the trees. This would come with substantial pains to the community. Potentially ones that knock-on to other pains.
You're at the root of why this is a tricky problem to solve. In fact there is no solution, just a wide basket of expensive things we should aspire to do to improve affairs.
What pain, exactly?
- The local public school goes from 80 kids per grade to 40, and a new school opens across the street or just rents an existing building from the existing school district.
- Funding stays flat, and academic performance goes up.
- Administrators get to decide which teachers to lay off, and they will be de facto fired if they get rid of the high performers while keeping the low performers.
- If the union contracts make it impossible to retain the high-performers, then the school eventually shuts down, and teachers that are competitive on the job market get hired by the new school for similar pay / benefits.
- Teachers at the new school get evaluated on whether they do their job, and the new administrators have a strong financial incentive to use performance-based evaluation instead of seniority / nepotism / whatever.
I see no downside whatsoever.