Posted my opinion in this thread on the housing forum:

http://forum.square-enix.com/ffxiv/t...-more-housing.

Ideal solution would be a lottery where you opt in to obtaining a house if you don't already have one and the game waits a day and at the end of the day randomly picks one of the players and notifies them that they have won the right to purchase the house, whereby they have maybe 3 days to purchase the house before it is released back to the public.

Alternative is instanced housing being implemented similar to how they do it in ESO perhaps.