We have been essentially metric for many decades now and I can't believe we want to go back to the less intuitive imperial system. 100p to the pound, 1000g to the Kg, 100cm to the meter is just far more logical than 240pence to the pound, 28 grams to the ounce and 12 inches to the foot.
Even those in middle age are not comfortable with the imperial system. Youngsters won't have a clue. As Peck has pointed out, we still use a little Imperial occasionally for nostalgic reasons like pints for beers and milk.
Let's use the "freedoms" from Brexit to do worthwhile things rather than taking steps backwards in time.