The import duty will go on any wine reaching the UK after Brexit. It is ‘only’ 8.5 p/bottle, but it is inevitable (and will then have VAT on top, so the actual cost is higher). If any of the FTAs with countries outside the EU are rolled over in time (e.g. Chile, South Africa), those countries won’t pay duty, so the relative price of EU wines will rise. So unless you expect the government to lower UK alcohol duties to help people to drown their sorrows or celebrate, the price will go up, and taking wine out of bond, if possible, makes sense, but may be less important than rushing to buy wine already on TWS shelves. The exchange rate will (continue to) fall. TWS has said it is doing some forward hedging, so prices shouldn’t all rise on day 1, but over time they will.
Shortages of fresh fruit, veg, medicines etc., may mean that we all need to buy more wine if nothing else is available.