It's likely the same thing is happening with Naruto that happened with DBZ. Perhaps the figures are unfortunately not selling too well back home in Japan.
Despite what goes on overseas, Tamashii's #1 customers (in their eyes) is the Japanese audience. The DBZ line started with Piccolo, SSJ Goku and SSJ Gohan all released into stores. By the time they had gotten their sales reports and all, they decided to turn the line to "Web Exclusive" starting with SSJ Vegeta. People argue whether the DBZ figures sold well in stores or not, but commonly what happens in the American markets is that when a product is no longer on store shelves and is "Online Only", then you know it's failed to meet sales projections at retail and stores are no longer placing large orders from the manufacturer. I tend to believe that the figures just didn't "sell well" at retail and make Bandai's sales projections.
So either way, they decided to go "Web Exclusive" and the line eventually turned around and is reputedly one of their "most successful" now. Mostly in part because of the International market in which DBZ is HUGELY popular. The new "Web exclusive" DBZ line even sells out constantly on Tamashii's Japanese Web Shop so sales are definitely solid in Japan. Will it return to stores there? Who knows?
How does this relate to Naruto? Well, maybe Tamashii will consider going "Web Exclusive" with the line which will likely result in lower production numbers but they might be able to make a better profit without having to ship product out to retail stores and such. Perhaps Naruto fans are just not Action Figure collectors, Tamashii sort of realized this with One-Piece and doesn't do much Action Figure-wise but releases A LOT of Figuarts ZERO One-Piece stuff.
It's not like the figure is terrible, it's nice, just not so nice when compared to the prototype.
