I'd be unsurprised to see WotC split the difference, actually and have "X's guide to the Planes", with a sort of Xanathar-style personality guiding us through the Planes. Just so long as it's not some GOOGLY-MOOGLY has-been Forgotten Realms "celeb" like Volo. He can go back into retirement. Bring us a REAL NPC from Planescape. Someone who says "berk" non-ironically.
(Note: portions of this post may not be intended seriously - adding this before someone decides to defend Volo's "honour" or something equally mad!)
They already made Shemeska one of the narrators to Mordenkein's Tome of Foes. Such a "Guide to the Planes" would likely be a Planescape Setting book, full stop, which is to my mind currently the most likely possibility.
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