I do like your ideas but it looks to me that you are explaining Dragon Age series.
About a future Larian rpgz I think that D:OS ediotor should be used to its maximum potential, in other words or make one more game in D:OS editor simply to save money and still have awesome game or remake old Divinity Games in that creation set. I personally hate when they make HD versions of old games(Icewind Dale HD), instead they should be remade.