I think timing of this event is whats also doing it.
It's a three day event, in a city that isn't nearly as big or traveled to as Tokyo (though I believe Fukuoka is awesome and probably the best city in this place) and most people in Japan straight up don't use their vacation days.
The weekend before EVO is a three day weekend that tons would travel for, but this one probably not. Even I can't really get off work for that Friday or Monday if I wanted to do the whole three days. People just don't move around in this country if they don't have the free days out of obligation usually. I -might- do Saturday afternoon/evening but then would be back on the train to my city while finals were going.
As much as I hate Tokyo, I think the benefits of entries outweighs the loss of moving it to a better location. Especially if EVO can't line itself up with a decent three day weekend or more.
Suck also because the last 5 or so months here in Japan has seen a MASSIVE push for esports and fighters in particular. Don't agree with how they are making events look like typical Japanese TV stuff, but hey any press here is good press I guess.