My theory on Dottore's future
I've been thinking about how the whole burning of Irminsul is missing a vital discussion point, and that to me is that Nahida isn't just burning Irminsul, she's also burning the host of it, which I believe is the perfect red herring in this story, the fact that Dottore is being consumed by every segment he's gotten rid of and seems to be merging into one, the fact that the latest trailers seem to heavily imply that these segments are all being purified by the very Gnosis that seems to be burning them to ashes, and the fact that Pantalone said that the experiment never really had to end is to me, a lot of bait from Hoyo.
I personally believe that Dottore and his segments have either combined with the Pyro Gnosis or the Pyro Gnosis has become part of Dottore, I think another thing that is ignored is that as Dottore is the Irminsul, he can take any info from a lot of the Archons and previous Pyro Archons, and yes, the separation of Natlan from the Leylines did happen after what the Night Kingdom and then what Capitano did, they were still part of Irminsul for many decades before that occurred.
I also believe that Pantalone has the Pyro Gnosis and that is the biggest mystery rn of what he intends to do with it, but the possibility that Dottore/Zandik could make an artificial Vision from the Gnosis and that he has a lot of references to rebirths, phoenixes and making himself whole again is very noticeable in this Archon Quest, I don't think the Snezhnaya teaser will confirm straight away about Zandik's revival, but we should still see something on what Pantalone will be doing in that arc.
Those are my thoughts and ideas, I may have got things wrong, so I can be corrected if so.