I always liked diplomacy. There was anyways enough combat in these games, so more diplomacy cant be wrong. In DA:0 there were enough dialogs where you could use this skill so it was really rewarding to develop it.
I dont know why people should dislike it. They always were able to choose the non diplomatic way. And also all people I know agree that this was one of the things which made DA:O a rememberable game.
When the 650k stretchgoal is reached, this will be hopefully part of it.
Also i think this wouldnt require much changes. There are already diplomatic dialog optiont, they are just at the moment dependent on your basic stats.