No, never, A rental fee would turn the game into a job, as someone who works IRL that would completely void any reason for me to buy a house.
People already have their time full with raiding, dailys, hunts, relic and do you reason think people will want to waste their time saving cash up for a rental fee?

Squares getting subscription fee cash, there is no excuse not to add more servers for more housing.
As they would add more servers for more players if it meant more money for them.