I've reviewed pitch decks and talked to founders of at least half a dozen companies aiming to provide pooling of workers with elastic hours across employers.

Including for hospitality, which has extremely high rates of attrition, and so while you can't just pull a random person off the street you can often pull a random person with experience from the same or similar chain from a database if you need urgent cover.

Reason I think at least some of those types of companies will make it is that I used to work on CRMs for hospitality, and saw the amount of staff moving back and forth between venues and different companies on our client list.

It won't replace middle management, but it may well reduce the numbers in larger chains.