In order to be the CoD of JRPGs it would have to be insanely popular as well. The Atelier series only has a yearly release schedule and nothing more. --- Mistranslations for the Modern Gamer http://mistranslationformg.blogspot.com/
No. Literally every guy I know in the western hemisphere that even has video games plays call of duty. That's how popular it is.
For JRPGs? Final Fantasy, no doubt. In terms of popularity anyways.
For Japan? The CoD of Japan is Monster Hunter. It's not a JRPG but in terms of what people play, as well as popularity, it's #1. There are online versions for Japan only so that adds a lot more to do compared to a mostly single-player series like Final Fantasy.
Gust makes quite a few games but I don't think they're anywhere close in popularity compared to what CoD or FF is.
FF is definitely it. The idiot immature fanboys and the immense popularity. If you know anything about expos and anime conventions, FF cosplays are probably the most noticeable and done. IMO, anyways. I've only been to 1 ever, but still.