Yup, when they're paying to heat empty homes in the winter then they'll be heating maybe hundreds of non selling locations so they don't mildew then they'll start loosing big cash on oil electricity plus shoveling roofs and walkways for showing off the places then the tide will change.
When they're shelling out tens of thousands a month to maintain empty properties and I'm not sure about taxes on investment real estate if that's a thing then getting them sold before taxes are due is another consideration if it's a thing or they get a pass.