In an interview with Dengenki Online, Yoshi P explain that they are going to be introducing more retainers as a 'paid' service.
There are so many problems with this, it's hard to choose one to start with.
1) Microtransactions in general, in a Pay 2 Play game
Apparently, gone is the days where your subscription fee pays for the game and all gameplay related things. Retainers should be purchased via in-game currencies or earned via questing. Microtransactions are unacceptable in a subscription based MMO, if players wanted to deal with them, they would play F2P games that are usually riddled and extremely hurt by these transactions.
2) The Pay 2 Win Aspect
It has been confirmed in 2.2 that retainers will be able to go out on missions and gather materials and more. The person who spends their real life money on more retainers will have more access to materials and be able to obtain them much quicker than someone who does not. This is literally the definition of Pay 2 Win if these purchased retainers are able to perform these gathering ventures.
There is much more to be said about this topic but I feel as though I've presented the most important information. I know if this change goes live, I'll be talking with my wallet and cancelling my subscription immediately.
What do you all think?
EDIT: Link to source interview
http://dengekionline.com/elem/000/000/824/824505/