I think the whole change is stupid, just like I still think all the new changes in Star Wars were stupid because all of this tries to re-define history. We've all been there where you look at something from your past (be it code you made, a post you wrote, a command block routine maybe even a redstone contraption) and in most cases you'll look at that wondering: "what the heck was I thinking?!".
Now, that in itself is a good thing. It means you're progressing, you're getting better and can even pinpoint which parts needed improvement.
But it becomes different when some of your contents was shared in the open, for others to enjoy as well. Because your history is what made you the person you are today. Maybe you think what you produced in the past was wrong or a joke or whatever, but what about all those other people who did enjoy (or still enjoy) all of that?
I think they should release their texture remake as an optional texture pack and leave it at that.
Of course in the end I'm completely indifferent to the whole thing because it doesn't affect me: I already use a resource pack.