Strickly speaking from a sales point of view, JRPGs haven't been popular in America. The only ones which have been consistently are Final Fantasy, Pokemon and the Mario RPG franchises.
To say an entire genre is popular, you would have to say more than 3 games are popular. So for the most part, he's right. Does this mean JRPGs as a 'whole' are 'dying' because they aren't selling 5 million in the west? Of course not. In fact, many JRPGs have done better this gen than previous gens. Look at Dragon Quest, Persona, SMT and Monster Hunter.











