maybe too his subsequent career slump in the 1970s was less about typecasting and more about stories of his bad behavior as part of the TOS cast.
Yes, of course. Hollywood was abuzz about the star of a minor (and failing) series that was cancelled, and how he allegedly didn't treat all the day players as full-blown stars themselves. Gee, who could blame producers for not casting him? I'm sure that was their very top concern.