What competition do they have on home consoles?
I mean sure, Tri didn't light up sales in the West, but it still showed that there is a market in the west, combine that with home platforms being more popular than in Japan (and the WiiU not selling), they just need an impressive title on PS360 or now PS4/XB1 to strengthen the IP in the west imo. Unless they don't care about that of course.
Even downscaled/"classic" titles for mobile platforms will sell well because people (especially in Japan) pay for fact that you can play on the go.
In monster-hunting action? Sure, none. In team gameplay, being the title you play because your friends are playing? They're competing for the same time investment as CoD, Battlefield, League, and DotA. Just with all the technical barrier to entry of the last two, and all the $60 game with $5 monthly sub on $400 box barrier to entry of the first two.