If this is true, I would welcome such 'spin offs' for the above reason. The next saga isn't going to feature iconic villains like Jabba and Vader - so the spin offs could be a chance to reintroduce these characters. And I'd love to see Darth Vader return to the cinema!
In addition to bringing back two fan-favorite characters as the leads of their own films, the Han Solo and Boba Fett projects would also allow Darth Vader, in full-on black death-metal gear, to return as a villain, since placing the spin-offs within the original trilogy would mean he is still alive and hissing. That timeline would also open the door for a return from visit with everyone’s favorite degenerate slug-like gangster, Jabba the Hutt.