“If a state fails to satisfy its own laws for appointing electors, then it fails to appoint any electors.”
State laws are null and void on this matter.
A unanimous Supreme Court ruling affirmed the clear point that no state can change in any way the authority of the legislature under the Constitution to appoint electors.
Note that that power is given NOT to the state but specifically to the legislature.
This is actually better then.
Th only reason then that the 3 states in question wouldn’t appoint electors is if their legislatures simply failed to do so. According to scotus the legislatures have this power, state laws be damned.
None of these three states with republican controlled legislatures will fail / forget to appoint electors.
Trump wins with 306 EVs.
A state’s legislature appoints Electors by passing laws which control that process. It would be up to each state’s legislature and/or Supreme Court to decide whether the laws enacted by the legislature had in fact resulted in the appointment of any Electors, and who those Electors actually were, if any.
And then Congress would have the final say regarding whether or not to accept as valid any Electoral votes submitted by persons claiming to be Electors.
What the Supreme Court specifically ruled in Bush v. Gore in regards to the question you're raising was that a state Constitution could not alter the plenary power granted to state legislatures in Article II and Amendment XII.
Why does this matter?
Because the Florida Supreme Court was attempting to arrogate this power to itself. The FL Supremes ruled in effect that since the FL Constitution had provisions, they were subject to judicial interpretation. That Judicial interpretation then fell to the judiciary. The US Supreme Court ruled that the judiciary had no such authority. Nor could a state place such wording in its Constitution to thwart the will of The People because the US Constitutional grant of authority was clearly intended to reserve the power of selecting electors to the People (through their representatives.)
Far from being null and void, state legislatures have plenary power to determine the statutory method for appointment. That is what the court ruled.