It already seems like a done deal to me.
I questioned the idea of Biden dropping out via press release on a Sunday afternoon, but so far it has proven to be a masterstroke. They took advantage of a lull in the news cycle to completely control the narrative and present a united front in place of all the infighting we had just a day before.
I think they were arguing for stability (and against people arguing for AOC to jump in the ring), more than anything. Now there's a clear path forward.