A single judge had ruled that there was a viable claim that Pennsylvania mail-in ballot procedures, as set out in Act 77, contravened the Pennsylvania constitution, Article VII, section 14, as the plain language of the section was in prima facie conflict with the mail-in provisions of Act 77. The Supreme Court threw out the single judge decision, arguing on the procedural ground that the law suit was out of time, being filed months after the time limit that the mail-in voting law allowed to be challenged, in accordance with that Act. But, the real issue is whether or not the law is constitutional, which was simply not addressed. This will then have to go to SCOTUS, just as Bush v. Gore (2000). But, I have little faith in the legal system, but it has to be tried. My guess is that SCOTUS will go to water and just ignore all of these arguments, and evidence of fraud.
Who know what will happen then. Maybe total surrender by conservatives, as usual. A long shot will be civil war, because that takes two to tango; genocide is more likely.