Before the inbred elites who have dominated England allow the pound to become extinct and join the euro; the elites will give serious thought to becoming the defacto 51st state of the US. Especially when the Americans are far superior in graft and bribery than their European counterparts in what will become a 'seduction' of the British to give up the pound except as ceremonial currency for the masses.

If the British are forced to choose; it very well may be the US even with the systemic problems it faces.

I do not believe Britain with 'The City' in ruins and an almost non existent exporting manufacturing sector can survive without either using a wealth tax on the elites (never happen), becoming extremely attractive to outside investors as a sort of 'multi Monaco' due to the civility and educated class of Londoners in addition to the combination of devalued currency and assets or finally making a deal to be the 51st state except in name and ceremony.