I can't see them hiding or removing it as it's likely meant to be a tell to show whether or not the player is merged - even if there is an icon on the buffs bar showing which archetype is merged. I think making it possible to change the colour, or for it to tie to a colour for part of what you're wearing, would be more likely but that'd just open a whole new can of worms and people would be asking for all sorts of abilities to get dye channels. Which, again, would likely mess w/ tells for abilities. I'd assume it's a lot more work than it may seem like and they probably want to have at least something visible to show the person is merged.