Hegel made a correct observation that dialectics between two opposites (thesis and anti-thesis) creates new matter (synthesis) and promotes the advance of history.
Currently, when the leftist ideas championed by the USSR and socialist movements were demolished, there is no counter thesis to create dialectics versus the capitalism, which in its turn causes the rotting and decay of capitalism.
This way, the basis of the western renaissance, the logic questioning of subject, competition between ideas and cycling improvement is in danger.
While Capitalism and Socialism were contending against each other, new and advanced forms of matter appeared in the friction lines - social-democracy, welfare state, social security and more.
Nowadays, it seems that regardless whether you are a western capitalist, a middle eastern Islamist, a nationalist Russian or a competitive Chinese - money is a tool and a goal at the same time. Thus, they do not challenge capitalism and capitalism isn't really challenging their core values. This way, western liberalism (what we used to wrongly call, leftism) is left without a defender and is vanished from the ideological arena.
I agree that these ideologies currently competing on world dominance do have dialectics between them, but not sure these dialectic currents are positive.
The left has left and we are left alone. It's our own responsibility to bring up a new notion of liberalism.