Hey, From what I heard, the budget needs to be approved by a 60% majority in the Senate. This means that the Democrats can currently veto a budget. If this is extended without end, could they functionnaly disolve the federal government and maybe start a new union of Democratic states? Do taxes continue to be perceived? What happens legally if the shutdown lasts until the midterms? Can states form another Union without leaving the current Union?
This is mostly a legal question, because the Democrats are never going to agree to such thing, and because the Republican would then start a civil war to stop it.
They could just get rid of the filibuster.
When you do it through reconciliation they only have 20 hours on the floor, so I doubt the Democrats would even bother trying to filibuster for 20 hours because it ultimately does nothing but waste their day. It would go into effect either way