Spot on MV.
BRS never sat easy with Flybe as it was seen as a major distraction for their main EXT base. With easyJet's continued expansion and now Ryanair also, I'm sure they still believe this was the right decision. But the instant the Flybe takeover of BA Con was announced, there was a mass exodus to the crew room door; long before the closure was announced, no one in BA BRS believed Flybe would stay.
Bar the Germanic region, the BA routes have been picked up by other carriers with at least as much capacity as BA ever out on. FRA slots are in short supply which limits potential carriers to one that already has an FRA slot to spare. Not sure about MUC & ZRH, but it may be the same.