(Image credit: BBC, Disney, & Paramount) Class has been dismissed rather earlier than planned, following the premature cancellation of "Starfleet Academy". A second season has already wrapped shooting — and will presumably beam onto Paramount+ early next year — but "Star Trek"'s paymasters clearly decided it wasn't worth persisting any longer with the final frontier's newest show. The teen-oriented spin-off becomes the shortest-lived live-action series in the franchise's 60-year history, and — given the extensive and largely unjustified criticism the show's faced online — many will say its demise is no surprise. But whatever your feelings on "Academy", its unfortunate fate suggests that all is not well at Starfleet Headquarters. Article continues below (Image credit: Paramount) It's a scenario that would have seemed implausible just three years ago when "Discovery", "Picard", "Lower Decks", "Prodigy" and "Strange New Worlds" were all on active duty.…