It won't bankrupt anyone. If you bought a house you could afford for "x", and you budgeted as if it cost "x", you still have a place to live if you keep paying the mortgage. All your plans remain exactly the same. If the "value" of the house goes down, you'll save on property taxes.
I’m in favor of lots of construction, because it’s the right thing overall. But it would hit me hard. I’m willing to accept that, so I lobby for new construction when I can. I’m just realistic about the outcome.
Realistically, it won't. The new supply will be apartments - not single family homes. It's not like people will all want to sell and move into apartments or that the desire for homes will go down. It just means competition for apartments will improve.
The above numbers are realistic. You have a choice to nice 3 bedroom apartments for $900/month in the Des Moines Iowa area. The payments on a 30 year loan for a 2 million dollar house are a bit over 9000/month.
That is, of course if you change a policy that was primarily designed to inflate housing prices to the stratosphere then it might negatively impact that, but maybe you were wrong to do that to begin with.