> Obamacare's modeling predicted that significantly more healthy people would sign up, driving costs down. It didn't happen.

It was intentionally fucked with. The requirement to get insurance was nulled out for those young, healthy folks. The end result was obvious - eventual collapse of the system.

https://en.wikipedia.org/wiki/Individual_shared_responsibili...

https://en.wikipedia.org/wiki/Tax_Cuts_and_Jobs_Act