Pretty bleak, and describes my experience to a T (although involving other companies). Has there ever been an example where a company has been acquired and culture/morale/conditions have actually improved rather than dissolved?
The Apple acquisition of NeXT has (only half-jokingly) been described as NeXT buying Apple with Apple's money. That's obviously an exceptionally rare case.
I wouldn't describe it as improved necessarily, but successfully integrated. This happened many times - youtube by google for example. Facebook acquisitions are pretty successful too (not looking if it was good for humanity, just from business perspective).
Some companies like Amazon buy companies and let them run almost independently - IMDB for example, Zappos, Twitch, Whole Foods, Zoox, Audible.