Interesting comment. Certainly endowment gains are possible, but an institution can still suffer short-term financial stress depending upon the source of revenue.
Tuition & fees, room & board are revenue streams that have been interrupted due to the coronavirus
Endowment gains or losses are typically paper gains or losses and the uses of endowment funds may be restricted.
The above assertions lead me to believe that full-pay students will enjoy an admissions bump during this year & in the near future.