Not chopping and changing is a good way to describe it. The business-owner has to make a decision at the start on what kind of business, as in airbnb, etc.
They can rent to the relative if a property becomes vacant.
This idea of asking someone to leave to move a family member in, is just wrong. (I have a relative who's a landlord and I would never ask or suggest to move in while there's someone living there, though legally it's possible).
Of course, evictions for non-payment, if that's what you mean, should be enforced.
Any eviction ban that might be brought in should be on the condition that rent is paid.
If not then then the landlord should be compensated for any rent that isn't paid. Actually would say that regardless of whether eviction ban is brought in or not. If a tenant has no choice of place to move to, and does not pay due to affordability reasons, the government should compensate the landlord, because the government has failed to provide accommodation for people who should be able to move if they need to.