Compared to most changes in this game, this one is actually going to effect the way people play in a huge way. While everything was pretty much in a positive light that made things more manageable or easier, this upcoming update is basically stripping everything you knew about your class and skills and turning them into something completely different.

Considering what's changed in one year we've had.
-Random xp gains based on your efforts in battle
-Fatigue
-Input every actions
-Battle Regimens
-18 party size I think
-Physical/Class Levels
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We've now arrives at this point:
-XP is gained at the end of every fight based on level
-Fatigue eliminated
-Auto-battle
-BR eliminated
-4-8 party size
-Class levels

Now we've arrived at the most major change it come ever since the games reform. I would say that having this change around the time they want to start charging is a horrible idea, many may just be turned off to playing a game that's taken a different turn in how their classes worked. With a change as heavy as this they should allow their playerbase to enjoy it freely and get a feel of it, while some may say, well there should be a one week free period before they start charging, I do ponder if that's enough time to actually let people adjust to see if they like it. With a change like this taking place they should consider keeping it free til jobs are released so people can actually get a feel of the whole change rather then half of a concept yet to be fully developed unless you're willing to pay and see how it turns out.