Your post rings true for me. At the same time, though, Campbell pointed out we can’t determine what the new myth would be, any more than we can decide ahead of time what we’re going to dream tonight – though he does point out elements it’s likely to contain (such as acknowledgement of the planet as one whole).
Also, most cultures don’t think of their myths as “myth,” but simply what is.
Given what the whole planet is undergoing in this coronavirus crisis (which in many ways strikes me as a collective death-and-rebirth initiation), feels like we are experiencing a true mythogenetic moment. I suspect the story we all tell ourselves will be dramatically different after we emerge from the abyss … but it may be years, or perhaps decades, before that picture becomes clear.