They will almost certainly experience a mass exodus of their top engineering, design, and leadership talent. They'll never come back from that. So it isn't that figma will turn to crap overnight, but over years it is guaranteed to rot, terrible features will start adding up, and adobe will start doing everything they can to pull you into and trap you in their expensive and crappy ecosystem.

So yeah it's sort of like climate change. Probably ok for now, but you should definitely start making moves to live somewhere else in the next few years.