Yes, this is a great change. Now the mindless AK grind can be even longer and more grindy, yay! They could have just improved the rewards from killing trash to get people to WANT to clear it, but no. It's a much better solution to just force people to do it. Because grinding just the bosses in one dungeon over and over and over and over and over wasn't fun enough. Now we get to grind the trash AND the bosses in one dungeon over and over and over! Compelling gameplay, at it's finest!
Sarcasm aside, I understand they want people to clear trash, but MMO players tend to be very reward focused, and there was and is no reward for killing trash, thus people try to skip it. In fact, trash actively costs you gil to kill it. Now it costs less gil to kill, but we are forced to take far more time per mindless dungeon grind run. Not the best solution to the problem, imo. =(