Last minute declare it moot, or kick it back to a state court or lower federal court, or somehow dismiss it without comment.
All possibilities. Yet.
Republican Party PA v Boockvar, is the election fraud case filed long before the election, where Justice Alito was forced to Order [PDF] that
"all (PA) ballots received by mail after 8:00 p.m. on November 3 be segregated" and kept “in a secure, safe and sealed container separate from other voted ballots”because of the inherent dishonest of Pennsylvania Democrat election officials.
Justice Alito's SCOTUS Order was not just disobeyed, but was specifically instructed to be ignored by these exact same Philadephia officials, and now Boockvar has been fired rather than chance her participating in any way during SCOTUS oral arguments!
Even leftist SCROTUSBlog believes Republican Party PA will be advanced to hearing/oral argument.
Now, as to your point. Well taken.
Please find any prior instance where SCOTUS issued an Order regarding the US presidential election and the state got away with willfully disregarding it.
And SCOTUS relief? Can't send it back to the Pennsylvania Legislature that made the original mistake, but Alito CAN send it back to PA Supreme Court with instructions, and make them eat the willful ballot fraud.
There are plenty of skilled lawyers in conservative media ready to make hay with Alito's majority decision in Republican Party PA (albeit they've had some ongoing help :)