Seriously i don´t see any need of this since:

a) Such tools already exist.
b) You´ve dummies to check the needed DPS for any new savage raids.
c) If people actually need a teacher to move from A to B or to avoid some ground aoe´s, then i don´t know... that´s what raids have become so...
d) Just play the game and get better? Isn´t the real fight the best practice?
e) I personally don´t want to see such tools which let us pick a mechanic out of the fight in the game. The content would "die" pretty fast without wipe and repeat to get better.
f) Wasted time and efford. We need content, better gameplay and UNIQUE classes in the first case.