Yeah they might try to follow a Han centric route though.
True they probably would, but there is nothing saying they couldn't go back to Han's early days and make the movie about a young Han that has no idea what he's doing. If that's where they want to go. Although I would probably like it better to focus on new people in the stand alones with cameos from the names.
I mean I'll be honest if they do an origin on Han, since RoTS was 20 years or do prior to New Hope, they could start it right after that battle on the Wookie planet where Chewie is shown with Yoda. Like after the battle Chewie leaves his world on a smuggler ship, which we find out after the iconic title scroll is the Millennium Falcon. With Fett (coming in a bit later) as the bad guy. Then again that's a different idea to be honest.