No matter how much different content a MMO has, people will always complain about it being in the same kind of way all over, and that count any MMO that has ever existed.

Traditionally they tend to be in the work market to late ages in Japan, I could see a 70 year old Yoshi P. still be creating content, and a FFXIV mk2 or FFXVII MMO would be nice especially if got some of the same features and eg, can get to transfer stuff over to the next level from FFXIV.