Switch's sales over the last several weeks have been really something. With first new 2D Mario entry in over a decade arriving in a few months, the system looks set to sell better in its 7th year than its 2nd.
As for FF... I suspect one of the main reasons for its stagnation in Japan is that it hasn't had a very cohesive identity for a while, due to its quest to constantly reinvent itself. Doesn't help that it's only available on hardware that Japan's not terribly enthusiastic about.
There was a time where FF was one of the top dogs there, but by now its power has diminished significantly.