to be honest, I'd rather see vigilance as the wasted talent point than concussion blow. for reasons check my recent posts in other threads.
and to be honest again, the current talent trees - at least for prot - are just perfect. you have exactly 0 talents which you are not able to not maximize. the only exception is a full self heal build, you only get 2/3 incite there. but everything else the talents are just perfectly balanced, so even if you would be able to put that talent out - where would you want to put it instead? for the mentioned specs, also check my recent posts in other threads.