rich47 - Obviously your premise is based on a potential outcome which no-one can predict.
In that sense, it belongs with every single question asked anywhere about the outcome of Brexit - because no-one knows, although lots of people claim to be making informed guesses.
The fact remains, that 'informed' or not, we are still guessing.
Intriguingly, your use of the term 'brexiteers' appears to infer that people who voted to leave the EU have that view as a profession which takes up most of their time. Clearly they don't - they are simply the larger proportion of the electorate who expresses their preference at the appointed time.
In conclusion, there is no answer to your question, one because there is no such thing as a 'brexiteer', and secondly because no-one has any idea if any jobs are actually going anywhere.