Now that's it been established as a hit right out of the gate it does make you start thinking down the line. How would one spin-off something that is a clear love letter to TNG. The answer seems clear and that is to do a love letter to something else you might love but is also in the same "universe." Let's say McFarlande loves "Batman."
Maybe on future earth you have a place called Gothic city and you have a superhero and sidekick who goes by the name of Batmale and Blue Jay who travel around in a fixed up space car called the nightmobile. They fight against a evil mime or a guy called the "Dolphin" or "Pun Man" or "Lionwoman." Always carrying around a trusty backpack filled with all sorts of crime fighting tools.
We also know he likes "Back to the Future" so how about a teenage girl goes back to the 80's and has make sure her great,great grandparents fall in love because a future offspring will be a key figure in making space travel a possibility. Basically the options seem kind of endless.
Jason
Maybe on future earth you have a place called Gothic city and you have a superhero and sidekick who goes by the name of Batmale and Blue Jay who travel around in a fixed up space car called the nightmobile. They fight against a evil mime or a guy called the "Dolphin" or "Pun Man" or "Lionwoman." Always carrying around a trusty backpack filled with all sorts of crime fighting tools.
We also know he likes "Back to the Future" so how about a teenage girl goes back to the 80's and has make sure her great,great grandparents fall in love because a future offspring will be a key figure in making space travel a possibility. Basically the options seem kind of endless.
Jason

Allura's eyebrows or lack of them, depending on the two different looks is already are first canon issue. Years from now when they do the prequels we will be arguing over whether or not her species should have eyebrows or not in the prequel.