"I wonder what the fallout would be", you ask.
There would be a wide-scale excommunication, with the forming up of the adamant opposition by the institution. It would have to be very, very public as well as within the internal routes and systems. Okay, so far?  
The rationales for the exclusion would be poster'ed, declared, broadcast and published. It would become headline news - within and without.  The patriarchalism, inanities, misogyny, prevarications, the mythical as well as the literal interpretations of Scripture and theological tomes will be exposed to the questions, repudiations and even ridicule they deserve. 
These women priests and the supporters, clerical and otherwise would coalesce among themselves, and increasingly by those who finally "see".  There will be, or come close to being, a schism and a negotiated re-union will be agreed upon.  
The "schism" will be of the uber-traditionalist, hard-liners but the road to a universal, variegated Christianity will be reopened.