I disagree from what I’ve seen so far. Most of the discussions I’ve seen lately about newly migrated reddit users have been folks who were lurkers or mostly lurkers. I myself used to be active on reddit years ago, but have been a lurker for a good 6-7+ years now or so. I think you’re correct as of a few weeks ago when powerusers may have migrated earlier, but I think the migration post-API implementation has been a large amount of non-powerusers. Of course, users that are 100% casual, and don’t have accounts at all or only rarely used Reddit, and might not even be aware of what’s going on, those folks I’m sure didn’t really move.