I believe PSA will survive, with a few ifs
If they aren't complicit at the management level.
And if they manage to get it together enough to restore confidence.
The Philatelic Foundation, which has an excellent reputation went through a similar scandal in the mid 80's, and actually has someone on the inside involved. They did a lot of work to rebuild confidence, and it took quite some time. At the time, they didn't grade, just authenticated.
https://www.chicagotribune.com/news/...069-story.html
At the moment, all three companies have had what are pretty major issues. They'll all need to address that in one way or another.
SGC has abandoned doing autographs, probably the right move.
What PSA will do about so many altered cards getting through, or what Beckett will do about a former employee getting what appears to be favorable treatment, we'll have to wait for.