I cannot speculate about the percentage of spas which will re-open of close permanently, but there is a market and ALL markets seek efficiency and equilibrium. A good many of the Asian providers have significant savings "under the mattress" here and back home. The Asian propensity to save is geometrically higher than Americans. While the silly ones may waste money on handbags and such, the smart ones have a safe somewhere, filled with cash. I've seen it for myself!
That said, the unpaid commercial leases will lead to some evictions. But the landlords will have no new tenants, so the current spa owners will simply sell their business to a friend or re-incorporate. The property and all furnishings will be at the ready.
As for the mongers, the savvy ones have multiple friends on mobile or WeChat. When restrictions are lifted, arrangements will be made to meet at homes in Flushing, in hotels and casinos, and on "vacations" with the hope of being first on deck. Lots of rested women and horny men will lead to very good days and nights! And then one day, the amps, like the sparrows in San Capistrano, will return!