To make things worse, the linguistic and cultural composition of Europe is much more diversified. This means a much higher friction for internal migrations, which would help balance economic mismatches. Moving say from Italy to Poland or from Greece to Germany to work requires a huge investment in language acquisition.
Another effect of language barriers is the difficulty of a paneuropean political discourse. In this respect, I am quite grateful to Varoufakis for communicating extensively in English and allowing me to access his and Syriza's message (whether I agree with it or not) out of the simplifications and potential distortions of my country's media.
18% of the EU speaks German natively, versus 13% for English. However roughly 50% speak English as a whole, versus 38% for German. There are 360 million native English speakers in the world, and only 89 million German; with a billion English speakers globally, and only 166 million German speakers.
[1] https://en.wikipedia.org/wiki/Languages_of_the_European_Unio...
No one said that English must be the only state language of Europe.
Which the Greek situation have showed.
The euro project was always a bit of a gamble. It reminds me of the German attack through Belgium during WWI. The german military high command was criticised after the war of gambling too much trying for a knock-out victory. Using the euro to achieve european integration has a similar feeling about it.
Edit. This is not a criticism of Germany in anyway, just an feeling I have based on the Euro project being a high risk, high reward strategy.
I'm not sure you would convince Ireland, Portugal, Spain, Italy, Greece that more Europe is good for them considering how bad it has been so far. ( we have hurt you, sorry, just let me be in charge and everything will be good now )
For the rest of the countries, Germany has taken the image of dictator of Europe, meaning that more Europe means more Germany telling you how to live your life for Germany's pleasure. Of course that's BS, but Germany is the go-to scapegoat and as they don't campaign anywhere else than Germany, so no matter how true that is, that is going to stick in people memories for decades.
If there was one official European language, as primary, it would be easier to unite the people. Language is the greatest divider. Just look at Belgium, or Spain/Catalonia, France/Corsica, it is still dividing people.
I don't even think Google Translate would help, because it could well be mainly the result of different languages causing different systems of thought.
I'm from Poland and I've always been a big supporter of the Euro, but I recently realized that it can't work in its current form. I would like to see a more unified Europe instead (we have much more in common than we think). Sadly, this is not likely happen mostly due to stupidity (populist and nationalist movements all across Europe).