If anything, if Hayden is in the film and gives us a good performance, that would redeem him in the Star Wars universe. People will see him as that excellent role in The Last Jedi and not annoying Anakin from the prequels.
It legitimizes the Special Editions and every other terrible ass change Lucas did.
The fact that the Special Editions have been commercially available since 1997 legitimized it, whatever that even means.