No, they can easily not update to v30 or not run libre relay, but instead continue running v29 with their data carrier preferences and still be within protocol rules. They would thus be exercising their choice. If more become aware of this, the propagation path would remain niche and limited. It's their choice to make. Looking forward to seeing how this unravels.
you can't stop economically motivated actors from getting around it. its not hard to run libre relay over core or knots.