If Scotus agrees with the lower courts they’ll just allow their bans on Obama’s actions to continue.
Then they can either render a ruling, or send the case back down for a decision in accordance with the principles set forth.
I am not even clear on the procedural posture. Right now there is just a TRO, I think. This can go around and around for a couple more years. Lawyers and judges getting rich while the invaders are free to enter as they please.