In their minds, this also resets the center point for what they'll demand in future 'negotiations.' It was a Lucy move with the football.
I'm fairly sure they're gloating over this, just as we're gloating over the Mayorkas vote. The upside is that now Dems own the high ground on immigration, and can hammer the Rs with that. With the issues that politicians can actually affect, I think the deficit is the only thing that the Republicans can realistically attack, now. That's not to say they won't continue to be thoroughly unrealistic.