Your wild theory is just that, a wild theory. A half baked imagining of some makey uppey dystopian future.
On the other hand is reality. The reality where Britain is actually fucked - now, in real life - and demonstrably so, and as a result of her own naive actions: some sort of national hysteria brought about by a curious mix of nostalgia for empire, pride, greed and xenophobia.
It's got fuck all to do with pride, greed or xenophobia and everything to do with the right to self determination!
You've given yours away cheaply!
I absolutely guarantee that some time in the future you will bitterly regret it!