I recall reading once that the reason the show even got approved in the first place is because Disney was NOT interested in a sequel. I'm not sure, though, since I can't find the interview about that.
Though Bob Schooley agrees that Cass finding out would be a huge deal. I don't know if the show would get to that eventually, but it should be interesting.
I’m glad we got a show instead. It allows the other members of BH6 to get more screen time and developing.