What you are trying to make overly complicated, WoW, is nothing more than a common market trend wherein the first brand to suit the values of the consumer sufficiently gets the most attention at the expense of all others. Which is exactly what I'm pointing out: FF and DQ were the pioneer series of what every other RPG that sells worse than them does. No other RPG save the Pokemon games has ever even come close to selling as well as they do.
The fine details are irrelevant; there is no "dominant" action RPG series, there is no "dominant" strategy RPG series, there is no "dominant" RPG series beyond those two save Pokemon. And Pokemon is so very different from them that many aren't even willing to count it as an RPG in the same sense as FF and DQ. A market with so many sub-genres which only has two very similar series that sell well with every other product selling only a fraction as many copies is not a differentiated market. It is a market of copycats, where the pioneers are the ones that reap the majority of the profits while the imitators pick up the scraps.
Sky Render - Sanity is for the weak.











