[jltsiren]

I like the approach Finland took when it abolished rent control in the 1990s. Basically, you are not allowed to chain fixed-term leases indefinitely. If the actual intent is that the tenant stays until further notice, the lease agreement must reflect that.

Now, if you have an indefinite lease, the landlord can't increase the rent, unless the basis for the increase is already in the agreement. Typically the rent is tied to a measure of inflation, and the landlord chooses once a year if they should make the increase.