Doug, I think the discourse to which you are referring IS the left strategy. The Left has always a strong tendency to escape from the reality to a utopia - be it utopian socialism of the 19th century or literary criticism of the late 20th century. The Hegelian/Marxist trick you are referring to was not only an exception to that tradition, but it became possible due to the changes of the material conditions of production (cartelization of the economy) rather than sheer appeal of an idea.
Unfortunately, the Left has ceded the control of the production to capitalists and it hopes that the ideal (contradictions, which are the realm of logic not reality, or an ideology with mass appeal) will overturn that control. It is not much different from voodoo or a prayer circle.
Wojtek