I think too much emphasis is placed on rule book mechanics and not enough on clear signals that communicate. That being said, I also think this new rule will take some time to sink in with the coaches, players and fans no matter what signal is used.
In addition to a decrease in the usage of the voice to communicate, I think text-book mechanics are withering away in favor of dynamic displays after tooting the tooter
I find it ironic that we bash the NBA for the players' actions but say nothing of the outlandish mechanics that come mostly from college. I'm all for individuality - I should be since I can't remember the last time I put my hand behind my head at the spot of the foul - but do not like to see cartoonish behavior that borders on the ridiculous.