I am of the opinion that PHX will be no better with a healthy Beal than they were with a healthy Chris Paul. In fact, my gut feeling is that they will be worse. How many primary scorers can a team accommodate? The more you have, the more you dilute the impact of each.
As to how this affects the Celtics, which is my main concern, I suspect that if PHX was interested in Brogdon, they are less interested now. Ayton is the only decent size they have. And now that they have Beal, I don't see where Brogdon fits. Would they start Beal and Brogdon with Booker at SF? Maybe.
I could see them trading Ayton to IND for Turner and a depth piece or two, which the salaries would allow for, but I can't see them still wanting Brogdon.