The democrats need to hold out. Trump can’t and won’t lose face so he will force the republicans to blow up the filibuster.

There aren't enough votes to blow up the filibuster for just a few weeks of government funding. No matter how much Trump jawbones Thune and the rest of the GOP Senators, there will be enough that won't go along.

They will get their clean CR, working class Americans will lose their health insurance, and the republicans will 100% own the economic disaster that will follow from owning it all.

Johnson and Thune aren't idiots. Even if they did blow up the filibuster (which they won't), they would introduce a bill in the House to restore some of the ACA subsidies - and then let the Democrats vote it down in the House. That's why it's so powerful to have the majority: you control the agenda, you can put things on the agenda that will help protect your vulnerable members, even if those things won't pass.

So GOP leadership will put a bill on the floor to extend the subsidies, it will get a ton of GOP votes and almost no Democratic votes, and die there. Then the GOP wouldn't "own" the end of the subsidies in the way you imagine. All their more vulnerable members will have ads they can run blaming the Democrats for putting in the expiration back in 2021, and then refusing to extend it when they had the chance.

Or....they do get enough votes out of the House, and it passes the Senate - and Trump signs the bill and takes credit for saving the workingman's health care.