It was more common for 4chan to go down, pretty frequently actually, 15+ years ago/under moot. However this is the first time (as you said) something of this magnitude has happened under hiroyuki, and since the state of the software and security has been revealed as mostly untouched since moot left, I think it spells that he and his staff lacks the competence to try to bring it back.
I also think that everyone is riding on the hope that it's gone for good wwwwwwwwww.