I hope they consider increasing the number drastically. It’s a disappointingly-low number, to be sure, but @Jens_Erik makes their motives clear:
Since we need to implement a limit for followers, random followers will be deleted periodically until the cap is respected. We recommend organizing any thralls you definitely want to keep before the patch hits. We are not able to allow you to keep “legacy Followers” that go over the Follower limit (let’s be honest here, no-one should have 400+ Followers strewn about their base as a means of lagging out other players).
To sum up their motives:
- We need to implement a limit.
- Random followers will be periodically deleted.
- No one should have 400+ followers.