The biggest obstacle to geting a complete redesignation of ball criteria for legality is agreement of the ball manufacturers on those criteria. It is probably developments now being tested for the next "generation of balls" that is the obstacle. All that R&D money already spent. Surely Calloway, Bridgestone and of course Titleist has such development underway. How far in advance are the companies already planning? One, two, three seasons?
Given that they will all have to produce new balls to meet these new, currently unstated criteria, I do not understand the reluctance on their parts other than this R&D money already spent to get on board. The differences will remain, they will just be a proportional one.
New balls for absolutely everyone! All golfers. What an opportunity for sales. THE american dream, a whole new market (the same old one - they just must have the new product. If the new balls are required for handicap purposes, its done.
It is rather more likely that determining these new ball criteria is the obstacle.
Very over-simplified:
Lets say arbitrarily that you keep the same ball size and weight. (A good idea)
Use a standard club, face orientation, clubhead speed and angle of attack for testing, or use the same bench criteria with new standards. Voila!
Using a 120 mph speed (chs) or 100 mph chs is probably irrelevant or at least negligable.
Initial velocity (iv) of 180 with 120 chs reduced by 20% from (again just #'s) is 144, with 150 iv from 100 chs is 120
Side spin reduced a 20-30% figure, using same club percentages are the same
Back spin (There is no such thing as top spin, it is just a lower or absent back spin.) again reduce by a determined percentage.
... and a few other technical matters
THAT's all that needs agreement.
If ANGC decides to do it first and goes with a single manufacturer, who loses? All the other manufacturers.
Question is:
Should that happen who will fall in line and how quickly? (That's two questions.)