Here's a question no one has answered. Let's suppose the SCOTUS kicks it back to the PAGAMIWI state legislatures. Those are all Republican majority but there's the perennial problem of RINOs.
Does anyone know how likely those are to vote for Trump, or for Biden, or for not sending electors?
E.g. in PA Doug Mastriano wanted to have a special session to investigate the election but the state-level GOP leadership stopped it. However does anyone know how many Republicans support him? Look at the numbers here
https://en.wikipedia.org/wiki/Pennsylvania_General_Assembly
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It looks likely to me that a relatively small number of Republicans need vote with the Democrats on a motion to not change the existing elector choice.
As a lot of people in this thread have pointed out this is not completely terrible. The SCOTUS kicking it back to them like this and them getting a vote sends a signal that conducting elections where the state legislature is ignored is unacceptable and sets a precedent that the remedy for this is that the state legislature has to decide what to do.
I think it means we're not heading into a grim uniparty dystopia but rather we're going to have two years of Biden, midterms and then two more years of Biden. It's unlikely the PAGAMIWI state legislatures will allow things to go as badly wrong in future elections.