At the higher levels, it can't make things worse than they are now though surely?.... You'll then have teams that will sew it up a bit more so it's not quite as flappy as others, which then leads to more complaints. What if they run out of that type of shirt, does that mean uncontested scrums? if it is wet, perhaps teams making there patch damp with some sort of lubricant to remove ability to hold... I like the theory, but I'm not sure of it's practice in a real competitive game.