Isn't this "you'll be sorry" conjecture a little premature? 
This is a complicated negotiation process.
The UK has their agenda
The EU has theirs.
And don't forget individual EU members have their own concerns that aren't always on the same page as Brussels. 
Lots of  pre-bout trash talk from all sides and headlines like these:
 
"UK takes back the right to deport as Britain repeals powers from EU"
"EU will ban UK from cutting tax or scrapping regulation as price of trade deal" 

Will the UK get everything they want?
Maybe not.
But neither will the EU, particularly their United States of Europe dreamers.
In the end if the UK hammers out a deal that is more about trade and less about meddling by un-elected Brussels bureaucrats then I would think the Brexiteers may be quite happy. 
And I wouldn't doubt that more than a few member states would be happier as well.