Existance in Contradiction

We as Marxists provide a condition of existence of modern capitalism. It is not as simple as thesis / antithesis, that is, capitalism not being able to exist without its opposite. Marxism is far more of a critique of capitalism than an alternative (in its current form). What strikes me is that the actions of previous and current Marxists have forced the supporters of the capitalist system (that is most of the academic world) to refine their arguments, to become better at defending what we supposedly want to be free of. Can there be a revolution without theory? I am inclined to say no and am in good company in this opinion. Do our theories shape those of our adversaries? Without question (as theirs shape ours)! Does the mere existence of Marxism make capitalism stronger? No? It certainly forces a refining of theories used for capitalist justification. If we can not succeed without a (well developed) theory than certainly they cannot either.