My assumption is that when the lvl cap is increased to 66:
1) If the elite vanity is going to be a helm, not a shield, the new vanity helm could be kind of "Crafted" with the CoP so the people who had CoP will get a better bonus which they deserve.
2) The elite vanity could be a shield again, and I'm not sure how they would work that out... Maybe the No.1 way or just a new shield.
3) And last but not least, STS could just make a vanity helm and make the bonus smaller than the one existing now with the CoP and SotH, so the players would stay happy. (The sewer grinding ppl)

Just a few of my thoughts!