After the clean immigration bill fails, with a No vote in the Senate, or a Trump veto, the Democrats will go right back to a shutdown with more ammo against the GOP.
They're not caving, They're doing a strategic retreat. It's Dunkirk.
I think it's more like Verdun - Trench warfare ...
This was a disaster for the Dems, and has every chance of setting up another. They did not cave they were smashed.