Believe it or not, I actually find myself hoping that she is slowing or even stopping growth.
Between sheer carriage hassles and people who find a way to be annoying in a multitude of ways, I'm concerned she might be getting pushed closer the point of considering the unthinkable ( to our point of view, of course ).
I'm just placing my hopes that she simply enjoys having those beautiful, amazing, absolutely incredible boobs - and wants to keep them as long as she physically and possibly can.
And if she does find and hit her limit - that she does decide to actively monetize those wonders before going out in a blaze of glory. (What a gift that would be, both to us her fans, and to her if it helps her to acquire financial security.)
-D'Artagnian