Yeah… My disappointment is immeasurable and my launch day has been ruined.
In all seriousness, my hope has shifted to them possibly allowing players to pick abilities separate from the covenants in the future… though the recent interviews make it sound like they would rather do anything and everything BUT that. So, you know… not filled with much faith at this point, at least not for 9.1. Maybe 9.2 or 9.3 if lucky.
/lets out a pained and drawn out sigh
…nope. I will be there… on my Fury Warrior. Loving my Covenant, it’s story, it’s characters, it’s rewards, my abomination, etc all while hating the ability I will be stuck with for the entire expansion. Mind you my melancholy is not performance based, I just really liked the Venthyr ability and how it modified Execute in a cool way. Was fun to play around with on Beta and I just really enjoyed it. I don’t care about the numbers or performance on the ability, I just wanted to have something fun instead of…
/stares at [Conqueror’s Banner] with disdain
That thing…
But, looking on the bright side, while I will not get to enjoy my favorite covenant ability I will at least be avoiding the dreadful party event that the Venthyr will be doing. I get to make delightful abominations instead ~ 
Still not looking forward to a whole expansion with the Banner as my new ability. I really do not feel good about the choice, in fact neither choice really felt great. I ended up just picking the least negative feeling one I guess.
Given their responses in the most recent interviews it looks like they are going to do quite literally everything to avoid doing that. Even mentioning developing ways to switch covenants as a whole without losing progress if they have to.
I really do not understand why they are pushing this so hard, it honestly feels like Azerite all over again.
But yeah, my gut tells me that it most certainly is out of the realm of possibility for 9.1. Maybe something for 9.2, but I am not feeling too confident at this point.
At least it creates a good looking/sounding bullet point for when they get around to announcing the next expansion. “We have learned from covenants and heard your feedback!”