This isn't an industrial revolution moment; it's a printing press moment.

All of those things probably work. Why do we have to give up so much that was considered standard 50 years ago? Recipe for social unrest.

>if the price falls too much it becomes unprofitable to build and you don’t get new supply

This is saying "building is expensive because building is expensive". Why is it expensive and how do we address it to make it cheaper?

Not an answer but an expansion on the question: yawns are contagious among mammals. If you watch your cat yawn you're more likely to yawn and vice versa.

That's how you make existing housing cheap. That's not how you make new housing cheap. We still have a shortage.