I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.
From looking at the diagram, aren't we starting the decade with such a system (gasoline)?
0timtyler
The graph you link to says magnesium and diesel already have greater energy density than fat.
So, I think you have to specify how portable, how common or cheap, and maybe whether you are talking about rechargable or not - or the prediction is probably going to be vague - and subject to the criticism that it has already happened.
I would like to propose this as a thread for people to write in their predictions for the next year and the next decade, when practical with probabilities attached. I'll probably make some in the comments.