[genocidicbunny]

> If they shut down the business due to no longer being viable, that seems to also be legally murky.

There's a difference between shutting down a business because some employees are starting to unionize, and shutting down a business because its financially non-viable due to extended negotiations.

If the business is somehow stupid enough to sign a contract with a union that makes them fail (and frankly, the union stupid enough to propose -- if the business fails, they still all lose their jobs) then that's really on the business, not the union. At that point they can go to court to try to fight the contract, or close up shop.