I was never in Bremen and left Ryanair a short while back.
However, at the time I left they were reducing the size of the base and pilots happily based there and living locally were told that they would be moved to another base as there wasn't enough work for them there. They were invited to submit preferences as to their new base but I don't know how many of them got what they were after. The risk of base size reductions and closures is always a big one in Ryanair outside of the major hubs.