https://www.youtube.com/watch?v=GvgTivwzcuoHe presents an interesting take. I didn't watch it all, but two early points.
He notes that the DAO *is* dead which is, of course, a pretty epic f-up.
He notes that there are only so many people who could have done this, 500 approx, meaning the hacker is not an outsider. I find this bit more worrying than anything else.
I'm an Ether holder btw so for me it is important this attacker is revealed pretty soon.
There was a thread with a post saying some ethereum miners were annoyed about the future switch to POS. There was speculation that had motivated an insider to hack the DAO for revenge. Some of the miners must have been earning giant returns and the threat of losing their source of income would horrify them.