I've not seen it yet and most likely won't until streaming, but I do think there is alot of meat left on the Wizarding World bone (from a story opportunity standpoint, minus JKR), just not in film format.
I would love to see a Hogwarts series on HBO Max, different time, current, after the books, maybe a Potter is in it, maybe not, definitley a Weasley though!
It also wouldn't have to be some big world destroying cataclysmic mystery, smaller well written stories, really highlighting "the magic" that has been missing form FB. Could be a larger story, one season per school year or could be something more like Black Mirror.
I think by far my favorite parts from the first 2 are the moments in Newts suitcase, those felt right on the money imo.