I don't expect the stream's plot to change or for assets to be made on the fly according to Evil or chat's whims, but it would be nice if — at the very least — the next streams in the arc could incorporate the improvised events and ideas into the planned sequences of the next ones. Some examples: A statement from John Bank being used as evidence against Evil in a hypothetical court stream, and/or Xeno making an actual appearance while assisting during a prison break stream.
This way it feels like the choices and chat interaction during these streams matter in some capacity without drastically altering the original plans for this themed stream arc.