I don't think I'd call it close to an exodus. But, really that doesn't matter. It doesn't matter to us if people are leaving reddit. What matters is that there's enough people here to create a feed with interesting subjects that we can reply to, or we can create content and people will likely reply to it.
We're at that critical mass now where the content isn't really a problem. There's plenty.
While we have that happening, over time as reddit do more corporately motivated rubbish to their users, they will be looking for alternatives and the threadiverse should be a tempting one.