Some people here seem a lot more interested in harming other people's in-game experience than they are in solving the actual problem.
They won't apply rules retroactively and even if they did, you'd still have to contend with the people who have multiple accounts and use them to hoard.
Until they fix the supply issue, there is going to be strong competition for houses and people will do anything they can to get an advantage over others. It's just human nature to want something because it is scarce.
The sad thing is, I'm already seeing large houses in Empyreium that don't seem to have been touched since purchase. Will those people let their houses go? Probably not when the chance of getting another one is close to 0.