It's only abstract until it manifests itself in the food on your supermarket shelves and the conditions of you're local community. They won't be able to blame the E.U for concessions they'll need to make to trade freely with the other large economies of this world, who's influence needs to be matched to meet them on a level playing field.
While I respect that there' a large number of brexiteers that would like a low tax low regulation economy one can hardly say it's the definitive majority of them. Whenever the topic of employment law comes up they seem quick to assure that UK law will match / exceed E.U protections, often enough they claim that it was the Brits who brought about the E.U law in the first place. (I'll just accept that all brexiteers, and thereby the majority of Brits, want an end to FOM, the amount of brexiteers who don't want that seems tiny).
Given that all brexiteers are only 51 % of the voting public they don't make up anything like the majority needed to throw out everyone else's protections.
And being a low tax country only really works in a larger network. There's no point for a company to have it's headquarters in a low tax country that can't trade with anyone.
