Hi,
I think it might be a little bit early to say for sure which routes will be dropped over the winter. Many airlines are still trying to work out how much they need to cut in order to survive another difficult winter. We should have a clearer picture by September.
Last winter Pula, Zadar, Almeria, Angouleme, Rodez, Toulon and Newquay all went into hibernation.
It looks as though discussions are still on going over Zweibrucken (article in German):
Ryanair denkt über Rückzug aus Zweibrücken nach - DMM Der Mobilitätsmanager: Mehr Effizienz bei Geschäftsreise, Firmenwagen, Veranstaltung
STN-PMO is currently not bookable for the winter either.
It has been known for routes to disappear from the booking engine and then appear again. Cynics might suggest that it could be a Ryanair tactic to get a little bit of extra "help" from regional airports.