You post at every chance for the remaining FF big popularity in Japan and yet you expect another drop from the already low XIII sales. How are we gonna determine its real popularity?
SE is still milking the FF IP and as long as they can keep doing it, and it is still a big money maker for them.
FF smartphone games have been popular enough for SE that they are making more of them. Mevius FF is coming soon along with Dissidia FF for Arcade. If this doesn't speak about the popularity of the series, I don't know what else.
The FF X|X-2 HD Remaster was the best selling remaster of a game in Japan. Better than other popular IPs remasters in Japan.
The recently released FF Explorers game on 3DS also sold pretty good.
FF Type-0 HD was released exclusively for the current generation and the sales are pretty good for an expensive remaster.
FF XIV is holding really well for a new FF MMO in today's tough market for sub-based MMOs.