All those things could happen, sure, and a recession will definitely drive down interest rates and values both (at least almost always that’s what happens) which should make housing more important.
a couple things to note regarding value as it pertains to refinance:
1) the houses with the least equity are Va and FHA loans, and refinance in those properties don’t require appraisals, merely paying on time 6 months in a row qualifies you for an appraisal-less Refiance
2) Conventional homes require merely to see 5% equity- starting point on the vast majority of homes is much higher than that
3) the best comp for a house generally is the purchase price of that house- it’s likely as you mentioned appraiser will err on the side of the borrower
4) the last time this became a systematic problem post 2008 market crash the government rolled out a program to allow this to happen- I’d expect similar here and it makes sense- if the original loan is backed by Fannie/Freddy no reason not to make a new easier to pay loan also so backed- it’s smarter than letting it default
recessions mean unemployment rate around 10 typically, right? So 2X as many people unemployed as currently I would submit that as minorities and poor are disproportionately hit by recessions, and least likely to own homes it’s unlikely that this would create a large group of homeowners wanting to refinance that cannot- especially in light of point 1 made above- but we shall see
A recession not caused by housing is generally good for housing in the above sense