In my opinion, reactives change the lanes much more than 1 person using urethane. And more often than not, everyone is using the high performance reactives.

I demoed the Pitch Blue last Thursday, and was very impressed.  I like the roll and tip better than the Natural or my Blue Hammer which were both nice balls.  As for banning urethane, resin balls with surface blow up a pattern much worse than carrydown from resin impacts it.  Not sure why it would even be an issue on a house shot.  If you cant adjust and take advantage of a little hold area that may be created by plastic or urethane, you aren't much of a player.