It is interesting to hear the various arguments for & against but none of them really convince me one way or another! Some of the biggies seem to centre on trade, immigration & the EU's influence on national government
Trade.
I remember as a young lad driving to my company's agent in Germany to deliver & collect goods from them. This involved quite a lot of paperwork & the involvement of appointed shipping agents to handle customs clearance at various border crossings. I had to park up with loads of trucks, find my way to the shipping agent's office cum waiting room (if you were lucky), a lengthy wait then a trip to the customs office, another lengthy wait, back to the shipping agent then at last off to the next border. Dover docks had huge parking areas for vehicles who had to wait sometimes days to clear customs. I cannot see how a return to this system will benefit the UK. The parking space at Dover docks is no longer available either!
Immigration.
I don't think the situation will alter much - the UK struggles to find accommodation for its own homeless now so unless a lucky earthquake will throw up another land mass in our territory it will still struggle in the future. We could always get rid of those silly farm things, I suppose.
EU control.
It is said that the EU makes all the rules but I seem to remember that every country can veto certain rulings within a certain time so that, if the ruling is not appropiate, that country can opt out. France has done this effectively for years while the UK's band of MEPs are too busy padding their expenses to actually attend the European council! That is why things still get done here generally unhindered by Health & Safety regs - my village uses a tractor with a barrel tied to the front loader to enable a man to access the street lights, while a perloined neighbour stops traffic. In the UK permissions to stop traffic would have to be applied for in advance, cones & traffic lights hired along with a proper lift. The cost to a small village would be prohibitive. I don't see many builders with hard hats either.
The local market would not pass UK enforced hygiene regs either, but France is exempt on some of these because their MEPs actually DO SOMETHING!
The UK is only dominated by the EU because it is too weak to say "that new rule is not for us". Instead it becomes part of UK culture &, although not the least bit useful, it is rigidly enforced! Other bits ARE ignored, such as the EU requirement for members to insure imported cars for a short while for the purpose of getting the paperwork in order. French agents are happy to comply & the insurance is valid throughout Europe - except the UK! If you buy a car there to bring here & you want to drive it from, say, London to Dover, you will have to tax, insure & MOT it in the UK for that 79 mile trip. You can insure the car with your french agent but the UK police will consider your car unisured (incorrectly, but it will still be impounded). You can only tax & insure a UK car if you are a UK resident which, if you live here & are buying a car to import, you are not.
The EU do have a rule to allow this but the UK chooses to ignore it - so it can be done!
The UK can be a member state without becoming a slave to the EU, just need politicians with backbone! Wonder what Trump is doing....