Dabo capitalized on a weak Tennessee, a weak Florida State. He no longer has that. He also had his best success before Georgia became the recruiting powerhouse they are now. He's lost his long term assistants, and he doesn't strike me as a big X's and O's guy.
He and his staff got outcoached against Duke. They've done a better job developing the talent they got, and they were more disciplined.
It's gotten tougher for him the last few years, and it shows. He will still be able to win quite a few games due to a weak ACC, but I think his run of dominance is over.