My read would be that, in general, this decision will throw out evidence of the conspiracy which shows Trump’s actions inside the DOJ. Other than that, maybe there will be a few things that are barred from court but possibly or probably not much. But, certainly, the trial court needs to run through all of the different arguments pro- and con- of anything and document why they decided that something was or wasn’t considered to be covered by immunity.
Probably, the most messy point will be the question of how the President and Vice President interrelate.
I think the way that the (concurring) justices view it, probably most or all of the communications between the President and VP should be private and unreviewable, but they’re willing to see the arguments for something else. Personally, in reading the decision (p16-32), I feel like they unintentionally made a good case for the VP to be considered (from a criminal jurisprudence standpoint) a co-equal entity of the President, itself. And in that regard, while the communications could arguably be considered completely privileged, I’d personally view it as the complete and total prerogative of the VP to dish it all out and make it public information as the President himself has right to. If the co-equal thinks that his partner deserves to get the hammer, then who can really question his prerogative? Though, maybe absolute immunity precludes the executive (or a co-executive) from being questioned, regardless of the personal desire to lay it bare?
In any case, maybe there’s an avenue there if Pence is willing.
But, for the most part, I feel that while it may be that Trump gained time by going to the Supreme Court for this decision, it effectively gives Jack Smith and his team, plus the lower courts, a blueprint for how to structure a case to prosecute the President in a way that will survive Supreme Court review.
So where it may have been that Trump would have been successfully prosecuted, there would have been so many flaws in the trial that the whole thing would have turned out to be turned back to the lower courts for a retrial. By the time it would take to get to that point, the government might decide that it isn’t worth it, or Trump may have received some pardon from some President who didn’t want Trump bringing his followers out for the vote during election season.
With this decision, it’s a lot more likely that, if Trump is successfully prosecuted, that he stays that way and he genuinely goes to prison.
My sense would be that the justices have seen most of the public evidence and they’re tailoring things so that the decision really doesn’t have any significant impact on the prosecutability of Trump for the false electors scheme or most of it. They’re fine if he goes to jail.
The big question would be, of course, whether Trump is able to gain office before his trial could begin.