I don't think there will be a war in Europe as a result of this misadventure. There will be economic collapses though. Spain will collapse if Catalonia go it alone, keep an eye on that if you're interested in European economics. That region of Spain is the economic powerhouse of the country. If they go alone, Spain will lose around E15b a year in lost tax revenue. But that's exactly the problem... the Catalonians are sick of paying more tax to Spain than they get back in services.

There's a similar perecption here, that the EU does not provide value for money. The only argument that holds any water is that it might have a catastrophic impact on many businesses here. But if our economy is reliant on being a member state of the EU, we've already lost our sovereignty, and should take it back at all costs.