Whether it's a 3rd film or a TV spinoff, there should be something done for Pixar's Finding franchise whilst the cast are still able to reprise their roles. Sadly it could be some time before there's a 3rd film, so the hopes Dory's voice actress Ellen Degeneras had on releasing less then 13 years after Finding Dory have been defied, plus Andrew Stanton has been working on Toy Story 5, although it actually wouldn't hurt if it was being worked on by someone else, but the rest of the 2020s for Pixar is pretty much already set with their lineup. As for a TV spinoff meanwhile, it wouldn't hurt to do that as long as like with Monsters At Work and Cars On The Road there is not a different set of voice actors, and that it's not something set before the events of Finding Dory, anything like that which shows what Marlin and Dory and Nemo got up to in the past year can be done in the form of something else, like say the same thing that something set between the events of Monsters University and Monsters Inc. ends up being. But whatever it is that gets done, please have it done whilst atleast Albert Brooks is still active and able to voice Marlin.