I think Parker would cos hell make millions from it. Wilder I’m not so sure about and it could make the AJ fight negotiations absolutely drag out with Wilder being the undefeated champ if that happens
If Parker wins he needs to beat Joshua in the rematch. Then of course the Wilder fight gets made. There isn't a huge power imbalance because Eddie Hearn wouldn't be involved. With Wilder Joshua it will very difficult for Wilder to admit that he plays second fiddle to hearn and has to take what he is given.
If Parker beat Joshua he needs to win the rematch too. If that happens then it will obviously come down to money. They compared numbers before and the money wasn't enough for them to make it but you would assume Parker's ability to draw would go to another level if he beats Joshua twice. I would assume Parker would take it he clearly hasn't been protected and is willing to take risks. But question is would Wilder and his team want it? Even if Joshua loses he's still likely the biggest draw in the division, if Joshua and Hearn offer Wilder more, maybe Wilder fights Joshua instead.