Players would be getting and losing houses more often increasing the number of players who would participate in housing for period of time.
Happens when half the housing threads are in general. Sub fee is not decreasing the demand as everyone pays it. Bots are always gonna be in the game, doesn't change stuff much.
Also taxes would make it harder for players to hoard multiple houses (even whole wards) which has been ongoing issue for long time.
It would be great if SE could fix the supply but clearly that's not likely from them. Players would not be happy about it, I noted that, but it would allow larger number of players to touch the housing briefly before realising the upkeep work is not worth having a single player house. It may seem like a punishment but it is not.