Picard will be in his 90s in his upcoming show
No surprise there. Picard was a decade or so older than Patrick Stewart in the series -- he was born in 2305, so he was 59 when TNG began, 74 in Nemesis. So if we're 19 years later, then of course he'd be 93.
Myriad Universe - Places of Exile depicts fluidic space as a multiversal singularity. The entire story hinges on no parallel timelines being possible for the Groundskeepers' home realm. IMO there is not a chance that screen canon will ever pick up that idea because, due respect to Christopher the author, it is too deep-cut physics for the average TV producer and average audience member to comprehend. Which is probably why Star Trek Online did nothing of the sort when depicting Species 8472.
Of course. I've never been under any illusion that the producers of screen Trek were likely or obligated to adopt any of my ideas. I'm just trying to tell the best stories I can, and to explore the science fiction ideas I want to explore as a writer.