That's not always true. If some company buys them they can halt/cancel projects in development, remove figureheads for games or whatnot. It wouldn't always be the wisest thing to do on the latter part but it happens.
When Atlus explicitly state on their official website and on Twitter that the consumer games business of the Atlus brand will live on as well as previously announced titles, I'm not going to think of potential hypotheticals that go against that.