A lot of those recently got new UHD or blu-ray releases so definitely not getting cancelled. Blazing Saddles not only didn't get cancelled it just got a new UHD 4k disc release not long ago and I think even a theatrical re-release.

The only one that I know outright cancelled is Song Of The South.

Although they have been mysteriously dragging on 4k UHD releases for Gone With The Wind and Breakfast At Tiffany's (even if both just had theatrical re-releases this year alone).

There have been edits at times to dialogue or scenes, pretty much only for streaming though and not for physical media versions (although maybe for TV shows a few times some episode was missing or changed even on physical media), sometimes just a word or two. Well actually a few times, basically all home versions of Lion King and Roger Rabbit had a few things changed and a few frames of most home releases of The Little Mermaid, mostly to get rid of stray dirty gags the animators snuck in. But Adventures In Babysitting and The Bad News Bears physical discs are the original theatrical while streaming, at least for AIB, has a brief dialogue change or two. The PG film Splash somehow still is stuck on DVD only (other than for a few small scale foreign blu-ray releases). The streaming version was changed for a few scenes to cover up nudity with CGI or re-framing although I've heard they put back in some of the original scenes again since, not sure if all.

There have, at times, been things like director's cuts or extended or special editions or altered versions and sometimes once they make a change all future releases take that on. At least with physical media you may have a choice to go see whichever version you wish (on at least some format or another). Streaming might lock you into a certain cut and that's that. Maybe the theatrical and not extended or vice-versa, etc. etc.

And some director's tend to think and a little change or tweak here or there with each new release.