Can you imagine how many people will buy this game (Baldur's Gate 3) if they gave us the option to switch on/off turn base mode? My personal opinion, and based on what we know so far, it will be turn based 1st. If the developers are going to give us systems that will give you more RPG options, then it will make sense for it to be turn based. Otherwise, your going to be hitting that pause button a million times to see what your options are? That's just not practical.
For me D&D games have always been to take my time and come up with a good strategy in solving problems in or out of combat. Now, when ultimately the game releases and ends up to be "pause and play" but allow the community to make a "MOD" so we can play turn base. I might still be happy, but it's too soon for me to Judge the game when I haven't even seen the game-play footage yet.