Doesn't make much sense. Collective bargaining is just that. If you trust the company to do what is best you should have no problem because the company will bargain for what it finds important. Also you seemingly care a lot about what would happen with a union, but essentially nothing about how you are treated by the company. That isn't really a very strong position to make an argument from. If your whole idea is that you don't mind taking other opportunities, presumably it would be worth it for you to move to a company that isn't unionized in the same way you would if you didn't agree with what he company was doing.