In theory, the main reason for EA / DICE to have changed the TTK, is that new players are abandoned the game because they are dying a lot.
What happens is that this new TTK will not change this. The beginners will continue to die a lot, but now they will kill much less.
What saddens most is that DICE is saying that the old TTK will be present only in Hardcore mode from now on. While simply the entire community, novice and old players, are asking for the old TTK to remain the official TTK of the game.