The important question is whether the recession due to the lockdown (which is at least useful for stopping the virus) will continue after the virus has passed and the lockdown is lifted.
Many small mom and pop shops are not coming back. Big chains, and franchises survive.
Permanent changes in customer behavior. Many people with resistance and habits against 'new ways' are forced to learn internet shopping and delivery. Their habits can change permanently.
Just as companies are re-thinking the fragility of supply chains that depend on a single country, maybe this will help counter-balance the consumer trends toward huge retail.
Yes, many of the ones that shut will not reopen. But new ones will be started. Over time, not all at once.
The most important one though is how long the lockdowns will last.
The answer to your question actually depends on how long lockdowns last. The longer businesses are shut down, the harder it is to restart them.
Most of those folks are contractors that pay rent (for their "small spot") or some sort of cut to the entity that owns the physical salon, right?
Though your point stands for the owners of such places, many of them probably working owners.