Considering all the other games from studios/publishers that are still here after Microsoft gobbled them up, I'm quite skeptical of any mass de-listings, i.e.:
-Obsidian
-inXile
-Bethesda
-Double Fine
-Ninja Theory

Such changes usually take a few years, if the publishing house is too big (Activision-Blizzard) then there shouldn't be any changes for century. And let's not forget about long term agreements between the original publisher and the storefront owners. MS might pull out Activision and Bethesda games from GOG in 5 years maybe but not now, and that would be a dump move. I hope that the whole process will work the other side and we are to get Halo MCC games and Fable one day.

Microsoft only announced their intent, it still has to go through regulatory approval

Of course there is a possibility that MS might not get a required Approval but I would be surprised if such intent was not backed up with solid research on legal and financial sides.

Well, I understand that everything is possible but, just as and example or a clue, Microsoft acquired Inxile around 2018/2019 and the brand new Wasteland 3 is from 2020, and It was available in GOG.

I do not see the point of hypothetical removing of old games when you are publishing new ones here.

Hopefully Microsoft paid attention during EA's Ultima/Syndicate hijinks and won't try to pull the same.

Oh, I'd love to see Halo MCC and Fable 1 & 3 come to GOG.
While we're at it - I wish Microsoft would port Fable 2 to PC.

Wasteland 3 was kickstarted. They probably couldn't remove it if they wanted. It even has Linux support I think (don't own the game), which ofc is rather less likely to be the case for anything else Microsoft release.

If it is true then Wasteland 2 was also Kickstarted. And Bard's Tale 4, and Torment Numenera. All safe, isn't it?
Well, anyway, let's accept the possibility. What about Wasteland Remastered? Also part of the kickstarter? Inxile did not release so many games. The removable titles should limit to a couple of them.

Honestly I have my doubts about the supposed Microsoft limitations if the games are kickstarted or not.
IMHO, They will be removed and renegotiated in the standard way when the licenses expires. I do not see removing a couple of games and not others for the sake of removing them.
Also It is not the same purchase studios in crisis like happened in the past than purchase pretty profitable ones. Different strategies and intentions. And different times.

Greetings

It does.

The Nightmares from the Deep trilogy, previously mentioned as being at risk of getting removed, got a delisting announcement today, and the delisting is scheduled for January 30:
https://www.gog.com/forum/general/nightmares_from_the_deep_series_delisting

Titles getting delisted:
Nightmares from the Deep: The Cursed Heart
Nightmares from the Deep 2: The Siren's Call
Nightmares from the Deep 3: Davy Jones

Adeptus Titanicus: Dominus is no longer available for sale on Steam, but still can be purchased here. Grab it, while you can! :p

https://steamcommunity.com/app/853140/discussions/0/4299250686376825317/#c4299250686377033331

Also on sale for -66% off, and the sale ends in a bit over 9 minutes.

Reigns: Game of Thrones

https://www.gog.com/game/reigns_game_of_thrones

Purchase disabled from Steam by request of the publisher.

About Reigns: Game of Thrones, I didn't know it was on Android when I posted the previous comment, but it seems it's been pulled from the Play Store as well, which makes it sound even more like the GOG version will be delisted in the near future.