[QuantumChaos]

>At a base level, as you can see in a lot of the replies, it comes down to "people believe that if they've been somewhere long enough, they now have a right to stay there as long as they like, and anything else is harsh and mean".

>Even if i thought this was right, I doubt you can find an economic model that allows this to happen, and can survive long term (and as evidence i offer that, in the history of civilization, nobody has accomplished this).

Insurance against changes in housing prices might let people avoid the effects of gentrification much longer. Imagine a bond that pays the difference between the current average rental rate and some "strike price" $X (when this difference is positive).