There is one single overwhelming and compelling reason why the UK should stand apart from the Eurozone, and it's apparent in the following graphic:-
In fact, the plummeting percentage of population of working age in the Eurozone is worse than shows above. Germany, with Japan, faces a reduction of more than 20% in the working age population by 2030; Switzerland, the Netherlands, Austria, Hungary, Italy, Portugal, Poland, South Korea and Russia are set to fall by more than 10%. The old Anglophone core of the UK, Ireland, Australia and NZ are expected to see modest growth of about 2% in the working population, the US 10%.
Buttonwood notes in the Economist "These figures are quite remarkable - not since the Black Death can there have been such a fall in workers - and the implications must surely be very profound." Japan, with an ultra-racist attitude to miscegenation, is doomed to oblivion, it's people extinct. Germany must start marrying and breeding with its Turkish Gastarbeiter with Teutonic alacrity if she's to pull out of the dive, and the rest of the Eurozone and Russia should prepare to admit hundreds of millions of first-generation Africans to stay afloat.