Again there has been no need and a few people have gone down the dual citizenship route but I only know of one couple. Those here (in France) before the residential right given by the EU needed a Carte Sejour which was straightforward to get - some Prefectures are now just giving the CS but others are still saying unnecessary.
I think the not guaranteeing the rights of people in another EU country or UK is a case of six of one. The EU are looking at a number of routes which could be taken for the citizens. It is UK which has instigated this whole mess so they should start offering things as a gesture of goodwill.
Enjoy the Antiques Road Trip except ...
meant it was not serious.