Brexit will happen. There is three outcomes. The UK will do well, the UK will do badly or the UK will remain the same.
I think the UK can adapt and grow as long as people step forward and make it happen. About it 200 years ago we abolished the Atlantic slave trade. Like today, many people thought it would be a disaster for the British economy. Well the opposite happened, the industrial revolution started and we became very wealthy.
Ordinary people had a better life because they could get a job. And machines out performed all the slaves and made many people rich.
When the black death plague occurred in the UK and Europe. It would have seemed like the end of the world but it was the opposite, an opportunity for the survivors to have more say about how and when they worked and allowed them to live in more comfort.
I remain optimistic that a post Brexit breakthrough will bring a brexit boom and wealth to the people.