The barriers include psychological refusal and debt on the building. But the main barrier, at least for residential property, is researching competing prices. This is solved by using a service. The same service all land lords use.

This is why there are no examples of any towns where rent is less than it was decade ago regardless of population decline. It is why there are rising numbers of working homeless in towns with rising vacancies.

It is the chief mechanism driving ever increasing rental profits which is probably why merely mentioning the existence of the service, its ubiquitous use and success draws such silent ire. Silent because of course anyone can just google for the service. It also does not match the standard narrative which no doubt annoys people in inarticulable ways.

Likelihood is a real measurable quantity with a real number attached. You can obtain it by counting the defection rate: the number who lower their rent. This number is observably zero.