The Brexit also hasn't happened in that Britain hasn't actually left the EU. It's pushed back the start if negotiations by two years, if it ever happens at all (or a shock speeds up the process of declaring Article 50)
A bit premature of the article I'd say. But in the end panic and fervor never match the on-the-ground realities. It's just hyped up in the moments leading to such an uncertain event. After the hype dies down a bit people realize no much has really changed.
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But if you actually do Brexit, there's a precedent for it turning out just fine.
I didn't expect that UK will leave EU quickly.
Such thinking really was very naive.
Political establishment, financial and business industry... was again this idea.
Now, they will try to delay such decision as much as they can and will also try to control damage.
Main goal is to stay as part of unique economic market.
I don't think that negotiation between EU and UK will finish in next 4-5 years.