One thing I'm waiting to see is how much physical energy she has left after that, and also if Kvitova can hold her level. But yes, Serena looks like the overwhelming favourite on the back of that.
I would disagree there are quite a few capable of winning this, Pliskova will be an even bigger test than today and then probably Osaka if she gets past Plis. Simona rather gave that one away when she looked good, could have gone for a bit more Williams can't run so the margins are better but she was a bit safe I thought in those key games. I think Williams is very beatable, my concern is Svitolina beats Osaka and Petra has a bad day in the other half, Barty with the home crowd is dangerous and I doubt she has the mentality to beat Williams, Svitolina has but Williams could do largely as today win on first serve and second return against her. I doubt Williams gets past Pliskova, Osaka, Kvitova, all have strength and improved fitness, none of them will be bullied, which was not the case today, with a 40kg weight advantage.