I also think about it this way: The PBA really put Hammer into a lurch, as well as could have possibly forced the USBC's hand.
Why? Simply put: The PBA rule and the Black Pearl Hammer coming up will mean that Hammer could/would undercut their own sales of the Purple Hammer. As the Purple Hammer won't be on tour anymore, the Black Pearl will get all of the TV exposure, so it will come down to hardness for the league bowler: softer with the Purple, or harder and newer with the Black Pearl.
That's good for giving two different urethane products for Hammer, but bad that it could also force the USBC to update the hardness rule for Urethane up to 78D so that no urethane under that can be used at the USBC level (impacting Storm, Motiv, and others). At this point, the Black Pearl (when it's released) will force the Purple Hammer out of the market.
Finally, this puts us back to 30 years ago: Urethane being "king" again, with the NU Blue Hammer being the equivalent of the Ebonite Turbo/X, X-Calibur, and Purple Rhino Pro. The question is: will the bowlers adjust, or will we have more whining about Urethane being used than we had before, which led us to this state to begin with?
BL.