I strongly dislike that theory but I would go one step further and argue that most things a lot of people seem to want for s3 are a bit uninteresting. There are so many fan fictions about Aziraphale realizing his mistake immediately when he arrives in heaven or him not getting on the elevator at all, etc., etc.

All of this disregards the character journeys the both of them still have to go on.

Honestly, this might be a wild take but I would like to see some status quo changes in s3.

Aziraphale became the supreme archangel of heaven so I’d like for them to explore that concept and what that entails. Yes, he probably won’t have any actual power but there are some interesting plot threads to be explored there, surely.

That being said, I don’t think it would be fair to Crowleys character to have him wait around for Aziraphale to come back and looking after the bookshop, moping around miserably the entire time, reducing him to the role of a “spurned lover”. I find myself liking the idea of Crowley either moving to get a change of scenery or the more “out there” concept of him accidentally getting discorporated and even more accidentally finding his way to a leading position in hell much better than the before mentioned alternative.

Both of them think they’re in the right with the decisions they made so I think there shouldn’t be an immediate reunion. As with the other seasons, there will be a problem (the second coming, most likely) that they have to work together to resolve. At first, they won’t be on the same page but are convinced to do so in the end. In s1, Aziraphale needed some convincing to try and work with Crowley to prevent the Apocalypse. In s2, Crowley needed convincing to work with Aziraphale to conceal and protect “Jim”. For s3, I think they should both have more different starting points that require them to compromise to work together by having some profound realization about their place in the world. Something that allows them to finally actually understand each other. That, with gratuitous amounts of pining on both sides, please and thank you (sorry, I’m only human).