That's not how I'm reading the ruling. It looks to me like the part that's really going to sting is that non union employees in a union shop would have to "opt in" to paying for political stuff, something that's not all that likely. Remember, these are the people who choose not to be a part of the union to begin with, so they're not likely to be big political union supporters.
If so, then better still. A union is not going to foster good relations with employees who might be leaning toward joining the union if they're "forced" to pay into a fund they don't approve of. They should be allowed to have the advantage of opting in rather than out, which of course is to the unions disadvantage, but in my mind, the right thing to do.
At the union I represented, even union members themselves had the ability to opt in, rather than being in by default. After all, there are many union members that don't want to be in the union they were required to join upon being employed, for reasons that range from their perceived disadvantages of the seniority system, to having to be "forced" to join a union at all to work at said closed shop.
Granted, unions are around because there is a need for them, otherwise they would cease to exist. I've been associated with many companies operating under the same union banner, and as a whole, the employees are much better off benefits and wages-wise than if they chose not to join.
That being said, in open shops where joining a union is optional, it's been my experience that closed shops having similar jobs manage to negotiate better wage/benefits packages for themselves, for one obvious reason: tighter unity. And for most of those open shops that I have been able to monitor, the unions have far less influence and power and basically noone is happy with the arrangement. This mostly due to the non-union, non-dues paying members having access to all the watered down benefits the union provides and none of the risk that going on strike present, with the dues paying employees in the union being apathetic toward their union for its ineffectiveness in representing their concerns. AND, most importantly, having management being able to exploit the two sides in ways that encourage all employees to fight among themselves and not with management.