The reason that DF stopped was the instigation of the EU Single Market, which allowed free movement of goods across borders, and that included Joe public being able to buy what they wanted, wherever they wanted to buy it, and take it to another member state. There were notional limitations placed excise goods to avoid people trading them without a licence.
Logically when we leave the EU this freedom, that can benefit every single citizen over 18 (for excise goods) ought to go. What replaces it heaven only knows, but at present there is insufficient space in most airports to accommodate large enough red and green channels to effectively police limits; same goes for surface access points such as the Irish land border and the Channel ports at Dover and Eurotunnel. I doubt many voters even gave this hit to their wallets when voting to leave the EU.
My money is on HMG putting in fairly relaxed rules in terms of quantities, but then strictly enforcing them, using profiling and APD / number plate data to identify frequent travelers on particular routes.