One complication you might not be thinking about here is that pro sports features an intersection between anti-trust law and labor law. These issues are getting all bundled up in the articles but should be considered separately by the courts. Whether or not the NBA is practicing unlawful restraint of trade is a separate issue entirely from whether or not their lockout is legal and the rights and obligations of employee/employer. They get bundled up because of the aforementioned non-statutory labor exemption (a delightfully mouthy legal phrase that no one else would have come up) because while employer and employee are engaged in collective bargaining the league enjoys protection from anti-trust actions brought by the union because of a national policy favoring collective bargaining outcomes over judicial ones. The entire point of decertification is to delink the anti-trust and labor law areas and allow current union members to pursue anti-trust claims.