How much of the "ruling class" actually get most of their power from the land they control? I get that price of property affects a lot of people, but I also think the "landlords" are a fraction of the political and economic power.

You seem to be forgetting that over here in the US we're all a bunch of "temporarily depressed millionaires", the wealthy landowners have and will continue to convince the voting public that any of the above rules would be detrimental to the not currently a millionaire class, and such rules should be prevented at all costs, less the dreams of them being rich will be permanently dashed.