.Unless the French decide they need the space they lease to the Swiss, West of Geneva. They could decide to take back and work their airspace
Vieux chantage ...(old blackmail ) to keep the Swiss on the edge.But not fitting the FABEC image very well I'd say.
Re the future of Reims as an ACC, that is interesting. In FABEC it is obvious that with Rhein, Maastricht and Reims one centre (at least) has to go. The German and the French think it will be Maastricht but the final truth might be elsewhere. Look at the recent investments made ( and already paid) in Rhein and Maastricht, both using very advanced systems (NFDPS and Favorit )both based on Indra,(i.e compatible) and the ability to increase the number of sectors instantly , ( Computing capacity and Ops room space. ) Then look at the sector capacities declared to the CFMU in all 3 centres.
Also Reims being State own and its staff civil servants, relocating them will be cheap, unlike in MUAC and Rhein.
If the decision would be purely on finacial ,costs-benefits, capacity terms, Reims is the one to go.
But that kind of decsion will be political,. not financial, so Reims will probably stay.. but who knows ?