The relationship between you and the landlord is the same as any buyer and seller of goods. If say Cadbury's decided to stop making your favourite chocolate bar, would you feel your rights had been trampled? Or if a shop decided to stop carrying some product you loved. Or if your favourite TV show got cancelled.

Or perhaps if the macro environment changes, should the landlord subsidize you when the bank is charging him more? Will the plumber give him a discount because he is a good guy? Will the supplier also give the plumber that discount because he's doing some work for a good guy who charges his tenants less than the going rate?

And what if the landlord's personal circumstances change and he or she desperately needs the money? Say they are no longer able to work?

I know that it is disruptive to move house, but in all likelihood the landlord isn't a monster, just someone who's trying to save for their retirement and has been scared out of pension funds by the smash and grab raid launched in 1997 (which I'll note the current lot haven't reversed).