My thought is that this is the beginning of the end. However Reddit will shamble on for quite awhile compared to how Digg imploded. There is still quite a lot of good content on Reddit in the smaller subs that haven't yet been dragged into the bigger fight or made the leap to Voat.
[–] varialus ago
I wouldn't be surprised if they've made some tool to try to ensure that the AMA goes smoothly. If it goes smoothly then I guess we'll know.