Well lets think for a moment why people hates JRPGs? Because it doesn't fit the current standards expected by the current attitude towards the fantasy genre.
But what do people expect from the fantasy genre now? To emulate ASOIAF, the political intrigue, the brutal cynicism and ultimately be as mature as possible. The funny thing is that JRPGs at one point was like that with Ogre Battle, Valkyrie Profile and Xenogears which served as the greats of JRPG. When JRPGs made the shift to making stuff lighter in content, WRPGs picked the ball up, using ASOIAF rather than Tolkien as their inspiration and has sold well compared to JRPGs which is becoming mostly kiddier.
So for JRPGs to be liked again, I recommend tossing in a bit of ASOIAF, some mature content and call us in the morning. We will dismiss the Turn Based stuff as part the genetic makeup of the genre. But the childishness is a disease that needs to be cured