I don’t get your argument about decrease in supply. It might be decreased in the scenario where there were no flipper, then flipper step in. But as soon as they start flipping, the lost supply get reintroduce into the system. It’s a closed system. Supply doesn’t go away unless they demolish it and not build anything in its place. Flipping by definition turns property around asap.
Btw, if you say flipping is a big part of the problem, then removing flipping will fix most of the problem. That’s where I disagree with you. I think even if flipping doesn’t exist, the bubble would still happen if lending standard was loose.