I really don't understand why professional golfers are such a bunch of bitches. World Cup skiing seems to change ski standards once a decade. No threatened law suits there. The NFL changed the rules on kickoffs, moving it up and virtually guaranteeing a touchback. Might not a guy who is in the league as a kick returner consider suing because his value has been diminished? The NBA told players they could no longer wear those hideous tights that were all the rage a few years ago. Might not someone sue, claiming the tights made him better and now the NBA is unilaterally removing that advantage?
The rules for equipment, playing surfaces, conduct, etc., in sports change ALL THE TIME. Golfers need to get over it. F'ing crybabies.