I wouldn't say that either. The Tales of series is a great JRPG franchise. Demon's and Dark Souls are particulary niche and old-school, yet they sold pretty well.
It's just that the interest of this genre has been dying. There are few JRPGs this generation that have cracked the one million mark. And we're counting DS sales here, with Ni No Kuni, otherwise it wouldn't have made it.