Reddit is going the way of digg. It's being mismanaged into the ground.
Essentially, the best information we have so far suggests Victoria was let go because she voiced concerns about some of the things the new management at Reddit wanted to do with how they ran AMAs. (I.e. doing video AMAs, allowing celebrities' publicists to masquerade as them, and other ways to commercialize it.)
That's kind of the trend with reddit. They want to commercialize whereever they can to improve the bottom line. The problem is that reddit isn't hard to replace. If they keep pushing, people WILL leave to go to some clone like Voat or elsewhere. And without users, no attempt at commercialization will succeed.
They'll say a few nice things to try and get those subreddits opened back up, and if they don't open back up, the nice things will stop and they will simply ban the moderators and take them over themselves.
Old man trouble back again
Fucking up my plans like oh no, oh no,
I'm back to the black again
Gettin fucked up again, oh no, oh no.