Wheel of Time would be great. It seems that whole series is neglected in the gaming industry, luckily Amazon is producing a tv series (I pray it turns out good)
Until I can see the finished product of Bannerlord (all of its new features). I have no idea what kind of modding will be really available. Like Static Wars total conversions for a true LotR conversion. But considering the scope of what I have seen it would be entirely possible to create a RPG like the old days (FF1-6 or Lufia) where you move the the world progressing to tougher enemies and eventually the end of the story and Boss Battles. Can you imagine a Fire Emblem style conversion utilizing the siege mechanics and companions.