I'm not much for reinventing old characters with old gimmicks. At least, not in the way hasbro does it now. If they weren't combiners before, they don't need to be now. If they weren't headmasters before, they don't need to be now. I've no interest in scramble styled combining Optimus, Cyclonus, Dinobots, Jazz, Ironhide... Particularly if they're absolutely horrible repaints that don't remotely evoke the original character (Sunstreaker, ironhide, prowl, hound).
I don't mind old characters reinvented with new gimmicks as much though (potp rodimus), or new characters added into older gimmicks. (Headmaster Windblade doesn't bother me nearly as badly as Headmaster Blurr, given we already had a serviceable toy for her, but not Blurr)