I don't think Sovereignty is " an angle being played". It is something that many people genuinely believe is important and have done for thousands of years. A few years (in evolution terms) of collective decision making will never erase that.
It is that desire for sovereignty and self determination that will acheive another leave vote despite all the economic factors screaming remain.
Another thing that will secure another leave vote is people, many like me who originally voted remain, voting leave to punish the politicians for seeking to ignore the will of the people. You'd think by now that they would have learned from history that any politician who treats the great British public with contempt is a fool.