It's not going to work for people with high latency (300 or more). Right now I'm playing on euro server only 'coz my friends and every time its my turn to interrupt on nefarion or other encounters, my back gets cold shivers . And its much harder in pvp, where screen show you players in front of you, but server think otherwise.
And remember, when casters going to get a lot of haste with next tiers, its going to be much harder for melee to spell lock them.