The obvious winner is Functionalism. Honestly while contemplating this in the 21st century if you ask most persons about the theories behind the actual frame you would find a majority believe more in the Marxist side of things. Just ask around.. I'm sure 8 out of 10 (or 4 out of 5) will say they believe 'The Man' is putting the low class worker down, or that 'The Gubmint' is supporting and running big business which is running all of our maw and paw neighborhood stores dry. But it is my honest opinion that functionalism is the framework which will withstand the tests of time.
In a world in which people are becoming more individualized, women are building up new industries, and anyone can start up their own business, I find it hard to believe that the bourgeoisie is claiming power. Historically, in the mid 20th century functionalism was in a decline. At that time in America it was all factories and factory workers. There was the machine, and the men who oiled it (ironic to use functionalism terminology in explaining Marxism). But with the internet bubble, women rights, and overall autonomy and power granted to persons on a more global scale increasing, the dreaded bourgeoisie were loosening their tight greedy fingers on the hard working proletariat (whether they wanted to or not).
With this trend doing nothing but increasing, I have a hard time imagining the whole Marxist framework rising to the top of the basket. But as a final example as to why Marxism is doomed to stay in the shadows.. look at history. It's had its shot at running countries and dictating ways of life, and it didn't work out all too well. After seeing its failure in a literal workplace I have a hard time imagining anyone pick it up as a broken toy.