Actually it would not spark a “redo”.
If SCOTUS rules in favor of Texas then there are several things that could happen. The worst case senecio would be those states set aside and then neither candidate reaches the 272 EC votes. At that point it would be i the hands of the state legislatures to vote on behalf of the state. Even then it’s unclear if it would fall back to every state legislature or just the 4 set aside.
Even if it were to go to an entire state legislature vote I think it still would break Bidens way. If at the end of the day we go through all this (and I think we absolutely should) and it still breaks Bidens way it will be a good day in my mind. The constitution will have been protected and maybe just maybe nobody tries to go around the constitution again. Furthermore the new rules for ballot collecting will be thrown out and legislature will have to do its job if they want change.
However if the EO is allowed to stand the left will be on here raising hell when the other side eliminates gun laws by the same method. (Keep an eye on Texas)
Asking everyone to follow the law is not unreasonable.