If they truly don't want the tech - meaning this is a straight-up acqui-hire - then the employees of the acquired company continue to have a job, and ideally some sort of bonus or earn out for staying N months or years. It is a nicer landing than bankruptcy.
The executives of the firm being acquired usually don't come, unless they have some skillset the acquiring company needs. But they (hopefully) get a cash bonus for the successful acquisition.
Everything is negotiable of course.