If the border wall dispute goes to a point of emergency, there would be implications. How deeply the administration and Congress will want to pursue those implications is a question to itself, with a likely answer of, “Not far.” But, the implications will remain.
Declaring a national emergency at the border is basically a declaration of being invaded by a civilian army. Like any army, this army also has a purpose and a moral cause they think to be right and fair. What invading army doesn’t? But, it would be an invading army of some kind or another because that’s what Constitutional powers the president would need to use to declare the emergency: repel against invasion.
The Constitutional language here compels Congress to act. If Trump were to declare an emergency to deal with the border situation—then a Federal judge stopped him—that judge would be just as implicated as Congress.
The implication?—Conspiracy with the enemy.
If an invasion can be stopped, but won’t be stopped by Congress or a judge, then they are conspirators with that invasion. This is because they are Constitutionally required to stop any force from invading, not only a deputized army sanctioned by a recognized state.
Trump might not be able to do much. Presidents can’t impeach anyone and members of Congress don’t answer for anything they do as elected officials to anyone except the electorate. He might be able to fire the Federal judge, but that won’t achieve anything because another treacherous scoundrel is sure to pop up elsewhere.
But, the implication will be there. What to do about it will be left up to the voters.