Sounds like it would be small enough to drown in the bathtub at that point. Mission accomplished.
> Congress could impeach for ignoring the court ruling.
Only if Democrats have a 60 vote majority in the Senate. Not happening. In the last impeachment, Trump argued he was allowed to extort a bribe from a foreign ally by holding up congressionally appropriated funds to benefit his reelection campaign, and as long as he did so with the benefit of the USA in mind, it cannot be grounds for removal via impeachment. The Senate agreed with him and acquitted him of all charges. Why in the world do you think that would go any differently a second time? And who is going to bring those articles? Republicans?
> The people could decide that, if he is going to ignore the constitution, then they're going to ignore him (and the whole federal government), since it's only the constitution that says that they need to listen to the president. If the president tries to enforce it by force, then it becomes a civil war
And herein lies the problem. This appears to be the only path forward if Trump keeps going in this direction and Republicans don't relent. Note he has already argued he has the right to use the military against US citizens.