Looking through /r/IAMA, and I can't say that I'm seeing that. If you look through the top voted AMA's of all time there, the vast majority are some years after Victoria's departure. Comparing those to the few on there from prior to her departure doesn't seem to show much of a difference, at least from what I can tell.
It does seem like the sub peaked a few years back, but again, that was still several years after her departure.