Speak for yourself. If all property drops, I'm ecstatic. I'm not moving or withdrawing money with a HELOC. So lower property values just mean less taxes for me. I mean, sure, it also means I may be underwater, but who cares?
And if I decide to move, that just means the delta between my current place and a new place is smaller in absolute terms.
There is literally no benefit to most homeowners for the real estate market being higher.