Again this all depends on what happens over the next two years but the Brexit could mean a surge in marriages between French and British couples in bids by the British nationals to gain French citizenship. L'amour is in the air the longer the uncertainty goes on.
To qualify for naturalisation through marriage you have to have been wedded for four years. For those unable to find a French partner, or at least one who is willing to marry them in exchange for a passport, all is not lost. You only have to wait one more year (five in total) to qualify for citizenship anyway.