Do you think that will change much whatever happens?
We will still want BMWs, Mercedes, Audi etc.
Italian and French fashions will still be worn.
We will still drink Wine and eat cheese snd bslsamic vinager.
Most of the flowers in florists will still come from Holland.
A lot of imports from the EU are prestige and high end items, those that buy thrm won't switch to domestic items with a perceived lower status, in fact higher price will increase their ststus to a certain extent.
At least we still have Rolls Royce, the best BMW in the world.