Hal 9000 said:
I wouldn't mind if Vader appears in Rogue One with Hayden kickin' around inside the suit, if he really wants to. But Hayden in the sequel trilogy doesn't compute.
Even if Vader appears in Rogue One, why use Hayden? He may have buffed up for the prequels, but his scene as the masked Darth Vader made it very clear that he's no David Prowse.
I agree that I don't really want him to appear in the sequel trilogy. Partly because I'm not a fan of his performance, even though I believe Lucas' inept direction to be partially responsible, and partly because Anakin's story has been told.