Someone having their role change sounds fine, but it often means a skill and thus a longer term salary reset. Individually people may be better or worse off, but generally if you have 20+ years of experience doing something starting over is a major setback.
Granted for very slow transitions it’s not as big of a deal.
The one situation where I remember this happening specifically (when the BBC made footage archiving digital), they planned the automation rollout to coincide with retiring off the old analog librarians.
Then they hired them back out of retirement because the project went badly wrong.
The latter part went awry (although I think they didn't mind too much) but the timing kind of worked out.
In a more vicious corporation they probably wouldn't have been so bothered about the timing of the rollout.
Granted for very slow transitions it’s not as big of a deal.