Ditto to what czechboy posted.
While I think a non-violent combat system can work (The recently released Renowned Explorers: International Society proves that)..
It's a massively different style.. To the point it doesn't even feel like the same genre.
Due to that I don't feel that style of game works as a sequel to what are awesome, violent, classic turn based rpgs.
Give it a different name, name the characters differently, but maybe set it in the same universe and i think people will be a lot more receptive to it.
Releasing it as a sequel to me would feel like if SQEX released FFXV as a pure simulation driving game.. I mean yea the spin off final fantasies that aren't rpgs at all are sometimes fun, but for a main line sequel to be a totally different genre would really upset a lot of fans.
Anyways thanks for the first 3. Eagerly awaiting mardek 4, just hope it won't be this game. Waited 5 years, can wait another 5 for you to make it :