Not everyone is taking an upgrade. Some for QOL, some just because they aren't CA material, some for other, personal reasons.

There are a few CAs who have numbers at other airlines getting ready to make the decision to stay or leave. Some may leave.

But, most importantly, just because nothing has been announced regarding further expansion, doesn't mean it's not in the works. Not saying 2.5 years to CA will happen again, but I'd be real surprised to see a "legacy-like" upgrade schedule here.