What do you think Springtrap's reaction to Bluey would be? Hateful because he doesn't like kids or fascinated by how well done it is?
Also, have another hot chocolate.
Pursuing the industry of family entertainment, William would hate mindless children programing. Absolutely nothing in the same vain as Teletubbies would be allowed in the Afton household. Meanwhile, stuff like Sesame Street he wouldn't just allow, but he'd sit and watch it with the family, and Bluey would totally be on his list of shows like that if it was made back then. During an episode he might've copied something Bandit did/said and messed with his kids before they go back to watching the show.
With the fact that Bluey wouldn't have been around yet, meaning that if he realistically saw it it would be as Springtrap, he would probably just watch it silently and think about how it would've been one of those shows.