are still lower than anything they'd be able to buy/rent today, is it really that big of a deal?
Underwater on a home someone paid $600k for at 2.5% that's worth $550k today doesn't really mean anything unless they need to sell - their $2k (or whatever) mortgage is still going to be better than buying a new $400k home at 6.5% or trying to find a rental.
And with how homebuilding has fallen off a cliff again already, I think it's safe to say the shortage is going to result in the home values recovering in the next few years again (maybe not for some COVID destination places I guess)