Out of curiosity, how do you feel about changes to other non-D&D shared IP?
Depends what type, but I think we're talking about different categories. D&D, as a roleplaying game, is not the same category of "shared IP" as, say, film, tv, etc. For instance, for me, the only really good Star Wars media is the original trilogy; everything else runs from "OK, I guess" to "I wish I could un-watch this." It is kind of a bummer, because even though I can choose to only re-watch the original trilogy, there is a feeling that the whole franchise is "tainted." (And just to be clear, it isn't a big deal to me - I'm just trying to form a comparison).
But D&D is fundamentally different, or at least the way I approach it. I don't see it as "playing within the Star Wars universe." It isn't watching movies. It is playing an interactive game of imagination, set within an imaginary world of the DM's making (to whatever degree, from homebrew to published setting).
Meaning, when I play D&D, I don't see it as being part of a shared universe, like watching a Star Wars film. I see it as playing within a universe (or world) unique to the game group and table. Closer to "alternate universes" than "shared universe."
So it really doesn't matter how WotC changes the lore, at least if I'm DMing (and world-building). I never use published settings, but even if I did, I would adapt it to suit my needs (e.g. if I were to DM the Realms, I'd probably go heavy on the gray box version with bits and pieces from the 3E "white books"). My homebrew is my own - I decide what is within it, with some input from the players. But the same would go for "my" Forgotten Realms or Dark Sun or Eberron.
In other words, I see everything that WotC publishes (or 3PP, or other DMs online etc) as being a huge toolbox--or, perhaps more aptly--a box of Legos, ideas that I can use however I want, but just end up going in the big box of Legos that I use to build my own stuff.
Actually, it is almost exactly like how I used to play with Legos. I would buy (or receive) a new set, follow the directions to make whatever the set was, play with it for a bit, then tear it apart and add the pieces to my big box of Legos, to build whatever I want.