If Seven of Nine is the only character from Voyager who is a main character, then it still strikes me as a TNG spin-off, given that the main cast would also include Jack Crusher (Son of Picard) and Sidney LaForge (Daughter of Geordi), and probably some appearances from Beverly Crusher, Diana Troi, Will Riker, etc… As @StillPaisleyCat mentioned, it could turn into the Jack Crusher show, but even without that, Voyager characters would be second class citizens in comparison. I’d love to see Janeway, Paris, Kim, Torres, Tuvok, heck even Neelix (maybe not Chakotay) but they’d be cameos at best. And with 10 episodes a season, we’d be lucky to get more than one or two of those appearances.