Let's face it. The Revolution of the World is an Utopia.
However communism will always be in some countries, but never in all.
The proletarians have had better conditions in the 20th century than ever before, and that is because The Soviet Union frightened the capitalists.
As long as the capitalists thought, that there was a possibility of revolution, they were willing to improve the life of the proletarians.
In about a hundred years time from now The Soviet Union will be forgotten, and the proletarians conditions will again be worse and worse.
Then there will again be many revolutions, and the communists will again take charge of a big part of the world.
Then the proletarians again will have better conditions, and the communist countries will collapse!
In that way, communism will ensure that the proletarians' condition are tolerable, but it will never be in complete charge itself!
Doesn't that sound great?
Back to the private part.