The pro-EU businessman appealed to europhiles, urging them to act before populist and right-wing forces take over the continent and destroy the European dream. He wrote in online business publication MarketWatch: “Europe is sleepwalking into oblivion, and the people of Europe need to wake up before it is too late. If they don’t, the European Union will go the way of the Soviet Union in 1991.
“Neither our leaders nor ordinary citizens seem to understand that we are experiencing a revolutionary moment, that the range of possibilities is very broad, and that the eventual outcome is thus highly uncertain.
“Most of us assume that the future will more or less resemble the present, but this is not necessarily so.
“In a long and eventful life, I have witnessed many periods of what I call radical disequilibrium. We are living in such a period today.”
The next defining moment for the European Union is the European Parliament election, to take place in May.
The upcoming vote will likely see the polarisation of the two positions on the EU, with pro-EU forces fighting against eurosceptic populist parties.
Mr Soros said: “The next inflection point will be the elections for the European Parliament in May 2019.
“Unfortunately, anti-European forces will enjoy a competitive advantage in the balloting.
“There are several reasons for this, including the outdated party system that prevails in most European countries, the practical impossibility of treaty change, and the lack of legal tools for disciplining member states that violate the principles on which the European Union was founded.
“The antiquated party system hampers those who want to preserve the values on which the EU was founded, but helps those who want to replace those values with something radically different.
“This is true in individual countries and even more so in trans-European alliances.”
Europhile Mr Soros finds in Britain the perfect example of “antiquated party structures” preventing the people from expressing themselves.
He wrote: “In the United Kingdom, too, an antiquated party structure prevents the popular will from finding proper expression.
“Both Labour and the Conservatives are internally divided, but their leaders, Jeremy Corbyn for Labour and Theresa May for the Tories, are so determined to deliver Brexit that they have agreed to cooperate to attain it.
“The situation is so complicated that most Britons just want to get it over with, although it will be the defining event for the country for decades to come.”
While Mr Corbyn has ruled out a second referendum and looks set to deliver Brexit even if he seizes power, the Labour and Tory party leaders have failed to find a common ground for collaboration on Brexit.
On Monday, No10 stressed the Prime Minister has ruled out Mr Corbyn’s proposal of a Brexit deal involving a customs union membership.
Her spokesman said: “We are absolutely clear on this: we’re not considering Jeremy Corbyn’s customs proposals.
“We’re not considering any proposals to remain in the customs union. We must have our own, independent trade policy.”
Among the other threats seen by Mr Soros across Europe, there are Germany’s far-right Alternative for Germany (AfD) and the lack of pro-European forces in Italy able to represent Italians at the ballot.