Universal Acceptance of an election would logically require Universal Consensus that the Holy See is in fact vacant.
Even if you had UA that the "Pope" was a heretic, you would THEN have to have Universal Acceptance of the Bellarmine opinion, and not those of Cajetan / John of St. Thomas, etc.
Good luck with all of that. Really.
I'd say that they need to stop ... now ... except they really should have stopped 5 minutes after +Roy threw that out there. Grizzled Old SV veterans should have taken the SV neophyte out back and administered the necessary correction. But, to my astonishment ... many are going along with this.
Of course, what's funny is that many of them are allegedly going along with it "anonymously", meaning that they're not fully convinced themselves, and if they go ahead and hold this Council and they roll out a Michael III-ish type of "pope" or Pius XIII/XIV or Linus II/III , a lot of them would pretend they never endorsed it or had anything to do with it.
Politicians do that all the time. They refused to vote for or against the attack on Iran. And the reason is that they're hedging their bets. If it had gone splendidly, then they'd all have come out of the woodwork claiming they had been in full support of it. If things turned South (as they have), then they can claim they were opposed to it and wash their hands of it. Same thing appears to be going on here.
Heck ... I think Bugnolo might have a better claim to a legitimate election ... if we could ever find out the details.