The football goal is an antique. It hasn’t changed for a hundred years. What effect will a new form have? Will football become a different game if the goal is changed? The football goal has not changed fro over hundred years.
The change itself lies in the origin of the ball, its aesthetics. The form of the goal is based on the pattern of the ball and therefore it heightens the interplay between the two.
By changing the shape of the goal you managed to change peoples preconceptions of the game and therefore you could lure people to play that don’t usually play football.