What they should really do is have Rogue One be more of the blueprint for the bulk of these spin-off films; have some recognizable names and places and periods, but show us a new perspective of the universe. Show us the story of a faction we don't know or barely know. It's the perfect opportunity to jump into introducing the Old Republic to the broader audience or reintroducing Legends characters that were fan favorites. Even something like a live action Star Wars Rebels film can put the characters of that show firmly into the film canon in a way that opens up new possibilities for the films.
Expanding the universe is the approach Kevin Feige over at Marvel Studios has been doing and it's paid off great by tapping into that untapped source material. Kathleen Kennedy needs to do more expanding rather than rehashing the greatest hits. At the very least, they should be alternating between a Rogue One and a Han Solo and then back to a more risky film like Rogue One again. Their gamble already paid off once, I don't know why they wouldn't use what they learned to make Star Wars an expansive cinematic universe rather than doubling back on what they've already done, while leaving all the side stories to just the aggressive multimedia push in comics, games, novels, etc..
Expanding the universe is the approach Kevin Feige over at Marvel Studios has been doing and it's paid off great by tapping into that untapped source material. Kathleen Kennedy needs to do more expanding rather than rehashing the greatest hits. At the very least, they should be alternating between a Rogue One and a Han Solo and then back to a more risky film like Rogue One again. Their gamble already paid off once, I don't know why they wouldn't use what they learned to make Star Wars an expansive cinematic universe rather than doubling back on what they've already done, while leaving all the side stories to just the aggressive multimedia push in comics, games, novels, etc..