The failures and politicization of the ACA have caused us to be a little too dismissive of its successes and popularity.
Protections for pre-existing conditions and allowing children to stay on family plans until 26 in particular have made an incredible difference in a lot of people's lives and are wildly popular. So much so that it would be close to political suicide to try to remove them as evidence by Republicans controlling all three branches of government including both chambers of Congress and there is no serious talk of repealing them.
There is belief among a lot of its supporters that universal healthcare would have a similar wave of support if enacted and that the opposition is mostly irrational political arguments rather than people's true feelings about an actual policy. This is why the "ACA" polls higher than "Obamacare" despite those being two terms for the same legislation.