Incredibly important, as this has the potential to strike the Communists where it hurts-in their wallet.
The only question is one of if there are enough conservatives left in the public sector for it to make a critical difference.
Allegations of some '-ism' or '-phobic behaviour' or other have been used to force out people who don't march in lockstep with all the diversities and demagoguery and can be further used to make examples (justifiably or not) of those who break ranks.
Hopefully, the idea of keeping the money ordinarily contributed to the union coffers will offset the pressures to remain.