Eh, the suit by the various states shouldn't last long. They're trying to manufacture standing by complaining about the loss of money for their respective National Guard units for drug intervention, which has two really big problems:
1.) Federal law pretty clearly allows Trump the discretion to move the money around; and
2.) The national emergency declaration wasn't necessary for Trump to move that money around.
The suit involving the Texas property owners, as well as the possibility of the House filing suit, is a bit more interesting from an Article III standing argument, but I don't see the courts intervening in what is a clearly a national security/political branch issue. It simply is not for the Courts to decide what constitutes a national emergency.
I wonder if the national emergency declaration is nothing more than a distraction to keep the liberals chasing their tails in court.