Ideas of socialism and communism are no longer utopian: it is capitalism that is utopian. It posits a world where no limits on markets are required. As we can see that is totally unrealistic and threatens to destroy a whole planet. We must have limits on markets.
We could construct that inside the current political system, in theory. In practice that system is a despotism of capital.
Hegel’s end of history argument (which doesn’t appear in Hegel) is the wrong approach. Better Kant’s idea of a progression to a perfect civil constitution…:
The history of mankind can be seen, in the large, as the realization of Nature’s secret plan to bring forth a perfectly constituted state as the only condition in which the capacities of mankind can be fully developed, and also bring forth that external relation among states which is perfectly adequate to this end.
We are gyrating between ‘democracy’ which is taken over by capitalism, and an image of ‘communism/socialism’ that has no democracy. So our task is to create a possibly still imperfect but improved version of a civil constitution that is able to deal with the objections to communism and to bourgeois pseudo-democracy. The red herring of utopianism never enters here: the realizable character of this was proven by the emergence of modern democracy. But that was shown to be vulnerable to capture by capitalists. So a version of democracy is needed that can limit the despotism of capital.