Language diversity in a post-Brexit Union: a French perspective

Since the separation has been effective, English has officially slipped from being the 3^rd to being the 17^th most spoken mother tongue in the EU. As noted by E. Kużelewska, there are now more Slovak than English native speakers. Therefore, should English remain the European bridge language? Furthermore, as French used to be the most commonly used language in the European institutions, could it revert to being the European lingua franca.