Actually, it was pulled out of the Heritage Foundation's well-traveled backside.
The Heritage Foundation may have had part of the idea, but it did not ram is idea down the collective throat of the nation in defiance of the people’s desire. The plan Heritage advanced had none of the complexity and intrusiveness of the current 2700-page law, which was thrown together in a few months by people who had no clinical experience whatsoever. Eventually, after some consideration and feedback, Heritage dropped the idea. Obama did not.
The ACA is an interesting piece of legislation. Have you read it? The entire thing? Do you have to work within its constraints? Are you familiar with the functioning and shortcomings of the hideous National Health Service of the UK? Do you have either medical research or clinical experience? I have. I submit that if you too could answer those questions in the affirmative, you’d have a more realistic idea of the effects of Obamacare, and of the single-payer system for which you long.