I think there’d be too many expectations from a lot of people that’d potentially ruin the films whichever way they go.
I’d be all in for more personal stories set during the Clone War, I think it’d really do wonders for that time period. We get some of it from the TV shows, but nothing actually good.
But yeah if they want to stay away from the main saga at all costs I think the old republic era is definitely the most logical pick. I really don’t want it to be a Jedi story though, I think it’d be cool to see more Rogue One-like films.
You say there’d be too many expectations, but the Clone Wars has an even greater chance of “offending” people as it is directly connected to the films. And while I love the era there are many OT fans who don’t want to return to the PT, and I respect that… TOR is a fresh start for everyone.
I think about it like the MCU. You have a ton of comics/books/games on the era, and the producers are now free to tell their own story. Most complaints regarding the ST from fans has been towards inconsistent writing (agree or disagree). But by adapting characters you would be more in an MCU position.