FF11 was a horizontal progression system. FF14 is vertical. There is a reason for that. Its because that is the model which suits the majority of the marketplace these days. Yoshi P himself said that he isn't opposed to such a system but that he intentionally chose not to make FF14 follow that system because the playing trends of the majority are currently moving away from that. Its likely why FF11 ended up changing.

FF11 isn't going to change to a horizontal progression system. Yoshi P has ruled it out, at least in the current market place. That said he does seem open to some callbacks to the type of content you used to find in games like FF11 which is apparently what Eureka is supposed to be.