I think the Dem party have moved on from the "Its Hillary's turn" sentiment of 2015(ish) and are now in a different mood. Even back then, Sanders came out of single digit obscurity to almost beat her if not for the superdelegate lead and ensuing public perception that it would've been mathematically impossible for him to win. Next time around, he will benefit from not only no more superdelegates but also from the fact that the Dem narrative has shifted significantly from establishment towards progressive, to where many are actually demanding the policies Sanders has been advancing. If she runs, she would be smart to take as many of those polices on board before even making a decision, as the old school Clintonian approach won't work in the new, more progressive political landscape.