I know this is an issue of no real importance, but it bothered me right from the start, and it keeps hurting my eyes. In my opinion, there are several reasons to change "The Boot":
* The winged boot (πτηνοπέδῑλος) are the symbol of Hermes, the Greek Messenger God; and the appropriate use is to signify speed. Accumulating that much XP is a feat of tenacity, not of speed.
* This symbol is squished into a way too small space, and not good-looking in that spot anyway.
* There is a clear continuity in the PvE Ranks using crowns in ascending order, represented by colors.
* The worst of all, "The Boot" switches BACK to gold (rare) color. So, even if you guys decide for legacy reasons to keep the boot, it's still a sin to keep it golden.
My suggestion would be to just add a new Crown Color, maybe a royal red or an epic purple kind. If you want to make the last rank super-duper special with a different symbol, it would be still advisable to get rid of "The Boot" and replace it with something symboling tenacity or experience in general.
To see with your own eyes that "The Boot" makes no sense at all, a screenshot from the Wiki:
