I do believe we are! 
My main concern was with this quote:
I was worryingly interpreting that as saying that the current method of using Series that way is, in some way, “improper…” but, I’ve already made my thoughts on this known, so whatever. Series banzai!
But yeah, I certainly would not be opposed to the addition of an entity type like Franchise / IP / etc., or even a Work-type augmentation that fulfills that role, with a few more relationship types to bolster it… but I get the feeling we might not be getting that any time soon. It comes off to me like too obvious of an addition to not have already been done if it was something the MB team would have wanted, so I’m left to assume there’s some rationale behind it not existing currently. Or they’ve just constantly had bigger fish to fry for years on end.