Although anything that helps a player improve themselves is only a good thing, no amount of training or incentives will make a player who is deadset in their ways change overnight, that is just facing facts. You know, the old "you can lead a chocobo to water but you can't make him drink!" idea. Also technically the way the level 15-50 dungeons are set up, those (along with Guildhests, remember those?) was supposed to be the training for endgame activities, you were supposed to gradually become used to concepts such as avoiding AoE and understanding what abilities to use and when through trial and error while undertaking those duties.
The Hall of the Novice sadly is too rigid when it comes to it's training, as it literally tells you what you have to use to get past the 'test'. A lazy player will simply follow the directions to get passed it... and in an endgame raid or dungeon, still mucks up because they simply do not care or did not take their lessons to heart.
Once again, I don't mean to discount this idea, just I don't think it would help players get any better, in fact it would just be an incentive to make things worse, as idiots would only do it for the 'shinez' and not actually take the lessons to heart and become a better player.
