Every week or so, John Mark Reynolds does something that presidents of academic institutions rarely do -- he cleans his office at Saint Constantine School.

This isn't a symbolic gesture in an age of ominous trends, and now a global pandemic, that threaten private education. Reynolds always takes his turn -- with other members of his team -- cleaning administration offices at this classical school in Houston.

"We have no administrators who are just administrators. Everyone teaches. Everyone shares many of the jobs that need to get done," said Reynolds, reached at his "sheltering in place" home office. "We have a maintenance team, but we all help out. The first lady and I plan to water some plants later today. …

"We call this the economy of small."

Saint Constantine is a K-16 Orthodox Christian school, which means it offers four years of college credits. College tuition is $9,000 per year.

"Our whole model was created to survive the collapse of liberal arts education, while striving to preserve the core of liberal arts education through an Oxford-style tutorial system," said Reynolds. "This pandemic is only exposing the weaknesses of what was already a business model fraught with peril."

College educators have long known that painful challenges were coming in 2025, due to falling birth rates and the end of high millennial-generation enrollments.

Now, the coronavirus crisis is forcing students and parents to face troubling realities. A study by McKinsey & Company researchers noted: "Hunkering down at home with a laptop … is a world away from the rich on-campus life that existed in February."

What happens next? The study noted: "In the virus-recurrence and pandemic-escalation scenarios, higher-education institutions could see much less predictable yield rates (the percentage of those admitted who attend) if would-be first-year students decide to take a gap year or attend somewhere closer to home (and less costly) because of the expectation of longer-term financial challenges for their families."

This could crush some schools. In a report entitled "Dawn of the Dead," Forbes found 675 private colleges it labeled "so-called tuition-dependent schools -- meaning they squeak by year-after-year, often losing money or eating into their dwindling endowments."