There is more than the presidency on the ballot.
Politics is a marathon not a sprint. It may not happen in 2020, but it's certainly closer to reality than it has ever been.
Bernie favoured the radical overhaul it frankly needs. But if you can't get that, any progress is still progress.
https://stateofreform.com/news/california/2019/07/california...
Why expect more progress at the federal level?
Healthcare for the Democrats is like guns for Republicans. It's too useful as a wedge issue they can use to scare voters to the polls. They're more interested in yelling about what the other side will than passing the legislation they promise.