I don't understand all the discussion about Incite vs War Academy. Because most prot warriors will never have to make a decision between those two.
If you want to go for HS increased threat you probably take 2/3 Incite with your first 5 points in prot. It's easy to use another point out of the 26 remaining points that you have to put into prot to get to 3/3.
You only can take War Academy with your last 5 points (speaking about a lvl80 build). So you have to compare it to everything else that you may chose with this points. You can use those 5 points to get your self-healing. Those are two of the few survivability talents we actually can take. So most (raiding) prot warriors don't want to use the points for anything else.
I doubt anybody out there would ever consider to spend 2/3 additional points into Incite if they did not take the talent with the first 31 prot-points. So basically you either have already Incite after spending 31points into prot or you will not spend any points to get it.
So Incite competes with Blood and Thunder or any utility talent out of prot, and War Academy with Cruelty, Field Dressing / Bloodcraze and Blitz.
As soon as you get more points to spend, it's more about if you want to reach anything in the second tiers of arms and fury. If you are interested in Piercing Howl or Rude Interruption you probably don't take War Academy. If you want to get Second Wind you have to make a decision between War Academy and Blitz.