Well, Brexit can be a success in terms of 'sovereignty', 'control of borders' 'freedom from the ECJ', 'financial contributions' it just can't be in terms of trade, because that would make a nonsense of EU membership. And I think we can get the non trade stuff most easily by simply walking away. EU leaders have already clearly and explicitly accepted that there will be damage all round, the only way to avoid that would be for us to stay in, or second choice accept a Norway type relationship, both of which our government is not prepared to do. Their job is to maintain the integrity of the 27, not to be nice to us. So we will have to give way to some extent on € contributions, status of EU citizens, referring trade disputes to ECJ etc in order to get better trade terms, but these terms still won't be as good as any country in the Customs Union, e.g. Turkey. It will be interesting to see what the hardline Brexiters think of the concessions we will cough up.
But if it all collapses that's fine too, as our representatives will tell us (endlessly) that it was the fault of the enemy within undermining them and the hated EU 'ganging up' on poor little Blighty. An ideal scenario for our ever growing victim culture.