Given how many multi house owners have come out of the woodwork recently I fail to see how anyone can honestly believe requiring multi house owners to give up their extras would have zero impact on the problem. Again, using everyone's favorite example, it would be at least 26 more houses for others to enjoy.

I also personally feel that the fact you could only buy one house per character in a game that really only needs you to have one character was kind of proof that SE expected people to own one house but IDK. The blame lies mostly on them, but I honestly believe that the people who own lots and lots of houses aren't entirely in the clear either.

The ultimate issue, though, is that the housing system at its very core is a mess and ONLY instanced housing will solve the issue.