I am a cardholder with no other status. And unlike most people on this forum I actually buy BE fares pretty frequently!

I don't care at all what group I board in as long as I can stow my carry-on. If they split cardholders off to BG3 (and pushed the other groups to higher numbers) I wouldn't care.

If they push BE cardholders to the BE boarding group (and no carry on) I would probably cancel my card -- I assume I'm not alone and thus that Chase would fight such a change!