What will it take to run a 2 hour marathon?

I recently read something on Runners World about what it will take to run a two-hour marathon: http://rw.runnersworld.com/sub-2/

It’s a completely fascinating article, so I urge you to read it if you have the chance. If not, here’s a summary of the main points that are made:

• The right race needs to be selected
  • It needs to be cold (so probably March or November)
  • The course needs to be flat and straight
  • There needs to be a strong group of pacemakers
  • There needs to be a financial incentive for all involved
• The runner
  • Needs to be efficient in terms of VO2 max and running economy
  • Needs to be fairly small (5’6″ and 120lbs)
  • Needs a huge amount of self-confidence
  • Needs access to data and new technologies
  • will be young and ‘fearless’

The article is brilliantly illustrated with infographics and concludes that a sub-two-hour marathon is possible. It event ends with a hypothetical narrative about when and how it will happen.

Do you think that a sub-two-hour marathon is humanly possible? If so, when do you think it may happen? If you disagree, what are your arguments?