I always liked that scene, but considering how easily Cass was destroyed by DC's editors and writers, how important is Cass to the symbol? In my opinion, not very. So I can't really take her loyalty too seriously, especially if no one at DC does.
Cass is a great character and I think she can be independent of the main Bat Family, who at the moment are acting like douche bags. I rather read a book about Cass and Steph teaming up. They could crossover with Gotham City Sirens.