Luckily I don't think this will be too much of a problem. The Celtics had both a very efficient offense last year, as well as one that generates a high number of assists. Thomas' # of touches and dribbles per touch were not especially high for a PG, especially given his prolific scoring. And as much as many of us will miss Bradley, substituting Hayward's passing for Bradley's will be a very real upgrade.
Where the Celtics offense bogged down last year was at the opposite extreme from the Raptors -- no one aside from IT could create off the dribble and collapse a defense. Hayward has that ability, and Tatum certainly looks to as well. Too much isolation isn't a good thing, but neither is no isolation. The best offenses can do both, depending what works best against a given defense. We should have both in our repertoire a bit more this year.
I'm very excited for this offense. It could be second to only the Warriors.