For there to be a "revivial" in the RPG genre, I believe to start, the idea of there being a "JRPG" as opposed to just an RPG, would need to go away, or at least cause questions. By saying something is a JRPG, you end you start rolling off a checklist of features that are so well established, that one is then hard pressed to feel there is innovation. One could say the say same for "Western RPG", for example. I think what needs to happen for a breakthrough in non-sandbox style RPGs, is to have stuff like Demon's Souls and Valk. Chronicles, where when you start to try to argue they are JRPGs, there is a strong debate over whether one is or is not. What should happen is the game gets recognized to be an RPG, but then you aren't exactly sure what kind, but you enjoy it.
End result? You have something that will give RPGs a shot in the arm. The more you say, "Need to have a revival of JRPGs" the more you will get a pattern that isn't going to excite people at all, and will feel played out.