So i agree with your concepts, but I think we should be careful about 'altering history' for the sake of hurt feelings. Before you start talking let me explain. Unlike some folks that use this argument to prop up their favorite hate, I liken it to a bruise or a scar.
I.e. - Ignoring that a person is important to history because they were the bad guy is ... like saying, 'I broke my hand and had to have thumb amputated but because I don't believe my thumb is gone it never happened....' Better to learn that maybe this person was a POS and we shouldn't follow in their shoes.
That being said my issue is with the term race. D&D, to me, has always been a beacon of how to PROPERLY use that term. Human, elf, gnome.. et al. I think the issue of using the term 'sub-race' may needed some re-thinking. nervous eye look. But ancestry and lineage are left over from royal blood lines which were more offensive than skin color ( I am royalty because god wills.it...peasant)... And folk is Afro-centric and a gang term. (Yeah, I had the pleasure of living in a mostly black neighborhood as a white family after I left the military and it opened my eyes to how double standard the arguments are.) And a double standards, to me, is just as wrong and just as offensive.
Does that make me better than you? No. Neither does it make me a better judge of what's right and wrong. It means that anyone can make an argument for anything. Better to say, yep this is wrong, acknowledge it and say it was accepted and now isn't and move on as an anarchism (and if possible come up with a solution going forward but don't throw the baby out with the bath neither.)
There will never be a right answer. It will always cause debate, and maybe... that's what we should take away, debate is healthy, the hate, not so much. I love that our community, as a whole, tries to get to where we need to be, for me, that's far better than most communities. Are we there, by no means. Will we ever be, honestly, probably not. However, I still say we are better than most. So, how do we fix it?? Not sure I have the answer, but I'm willing to help us get there, even if it means poking the bruises to remind us that that pain was earned for a reason. And I'm willing to take the slings and arrows, if need be.
Baby and the bathwater...