Munster, Paderborn and most of the Dusseldorf flights are all operated by Q400s so maybe it's just a matter of time before they're shifted as well to LGW. Although DUS would face competition from EZY and BE. If they could get the slots maybe they'd send them all to LCY (not currently possible in the morning rush) as BA have been mulling the LCY-DUS for quite some time.
Even the STN-SZG (A319) could move to LGW and take over the BA ops..
Bit sad to see them leaving STN as it's much more convenient for us and they've always been a pleasure to use...