JRPGs are not as popular as in the late 1990's, but I think that they are in no way 'in decline' from last generation. The majority of what I would call the 'big JRPG series' are either seeing increased sales this generation or will by the time they are discontinued.
Those already outsold
Mainline Pokemon RPGs
Mario & Luigi
Paper Mario
Dragon Quest Monsters
Pokemon Mystery Dungeon
Ones that will in the future:
Dragon Quest
Pokemon Remakes
I didn't put Fire Emblem down due to missing numbers, therefore not really a fair test
Don't get me wrong, I think JRPGs are in decline from their pokemon RBY Final fantasy VII fuelled height, but I believe that JRPGs not called Final Fantasy or Tales are generally on an increase in popularity from last generation