What company would want to own branded Copaxone if Teva and MNTA were joining forces to bring generic Copaxone to market? The answer is: nobody.
Teva will never be allowed to buy MNTA for the reasons you stated so this topic is moot. Regardless the assumption that nobody would want own branded Copaxone if MNTA/TEVA brought generic Copaxone to market ascribes no value to branded Copaxone under this scenario.