That union was a last ditch effort to try and keep France in the war. If they had implemented it, it would have been undone once the nazis were beaten you can be sure.
replyIt was suggested again in 1956 in the context of the Suez crisis:
replyThat was also a last-ditch effort to maintain pre-WW2 geopolitical structures rather than a bipolar US-sphere vs Soviet-sphere world. Note that this was basically the nail in the coffin that led to their full-fledged decolonization in the following years. At the time the UK still held very significant military and political sway over the middle east, east africa, and asia
replyhttps://en.wikipedia.org/wiki/British_Empire#/media/File:Bri...
From my recollection, the plan was to grant French citizenship to every British citizen and vice versa, in effect "forcing" the governments to defend their citizens to the end. This was very ambitious, hence why it probably did not happen.
But if it had happen, I have a hard time seeing how it could be undone, stripping people of their citizenship, even if they have a second one is no trivial matter.
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