I think the numbers of those who opt out will be high enough that the union won’t have enough enforcers to cover it.
I’m betting at least 40% in the first couple of years. After that the union will try raising dues and dive out even more.
When I was at the P.O., (like and idiot), I joined the union, only to regret it later. Thing is we did not have to join the union, stupid me.
We were told you could only opt out on the anniversary of your starting date, which we could never find out when that was. Even if we could, they would change the rules. lol.
I quit that damned place after only 3 years of their non work, slow down methods of operating.