Let’s get back on track.

Having reread a few sites discussing what little we know of Lucas’s ideas, I think it’s safe to say the Whills would serve as the main protagonists and antagonists. Based off the only Lucas canon – the OT, the PT, and TCW – the force is best understood as divided into the light and dark sides. The Jedi were not perfect but there is nothing from Lucas that suggests they need widespread reform.

So I think we would learn that there is a Dark Whill somewhere that has brought evil into the galaxy, cheesy as it may be, and this being was what corrupted Sidious in the first place. Keeping in mind this would remain a Skywalker / Solo drama, I think Ben Solo may be the Dark Whill’s “next target” and start corrupting him to restart the Sith, and it will be up to Luke’s daughter to redeem her cousin and break the cycle.

I think this is a fairly basic plan that would fit well within the established lore of Lucas.