Blimey Alf, have you been recruited by Project Fear?
By the way, we already have logjams at the ports and airports. We already have factories and businesses closing and there's a fair bit of violence already in the streets. There's a reasonable chunk of social inequality and food shortages as well.
If you look at Brexit from the standpoint that everything about being in the EU is tickety-boo and a veritable bed of roses, then of course the doom and gloom view of leaving may well look like the picture you are describing.
If you think that disengaging from a massive self-serving, corrupt slug of an organisation to be able to pursue our own aims is a good thing - well, then the future looks a bit more positive.