One thing that I always wished in an RPG is to actually be able to talk to random NPC's and not have them just spit out one liners. Even the witcher 3 has this, just go to someone who is not an important NPC and all they spit out is one liners. I do not know how you would do this, maybe a conversation generator that can create conversations based on the NPC (if it has kids, relationships,its occupation, background, interests, ..etc).
The other thing I REALLY want is a deep conversation tree, and to have an actual INTELLIGENT conversation with someone. I blame voice acting for this. I want to be able to talk to characters and if I have a high level inteligence I want to wow them with my knowlege. Take fallout one, if you had a high inteligent you could explain to the farmer the benefits of crop rotation. Also, you can talk back and forth in a onversation and creat branching dialog paths. In the witcher 3 and most modern games with RPG elements. Your character is an idiot that talk one liner twitter feed dialog length. It is annoying. In cyberpunk I want to play a netrunner who geeks out about topics interested to him or is knowledgeable about.