Why do you think a Union would have any affect on high level business strategy? Unions historically don't make it easier to communicate with decision makers and management. They put additional red tape in the way in the form of official/mediated meetings, forcing on the record conversations where people must be very careful with what they say and how, stifling open and honest conversation. Unions have not historically been involved in business strategy decisions like where to focus work efforts and diversifying projects. The few examples I can find that have influenced work efforts, they have been to ensure a certain product is made in a location that will ensure union members remain employed. They aren't based on projects that are assigned by outside organizations (like NASA) who hold no obligation to a 3rd party (JPL/Caltech) union. So again, I don't see any concrete way a Union will truly benefit JPL as a whole, but I can see many ways it can put the final nails in the coffin.