I think a consortium is highly unlikely to actually have the kind of influence that Blogstar thinks not unlikely. I think that some other, unspecified system besides capitalism is slightly more likely. But I think more likely than that is sort of chaos lite. Continual shifting of wealth between different groups (be they countries, companies, people, hemispheres, participants in certain economic systems, or whatever), chaos in certain parts of the world and stability in others. This could last for hundreds of years or longer. There might be periods of relative stability and periods of relative chaos. Scattered wars and revolts. Really not too unlike we have now, but with a weakening of the most powerful economies and a slight strengthening of weaker ones.
I see capitalism as always being a major factor. Perhaps I’m shortsighted or naive. I am very curious what kinds of other systems other posters see in the future.