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in fifty or so years when humans go to Mars

Is this our current expected timeline?

Lacking immediate political or economic drivers, I'd say this is realistic. Neil deGrasse Tyson has a better explanation of why this is the case https://www.youtube.com/watch?v=ErZq2ZQQTrs (starting at 7:45 or so)

Mars One intends to land its first crew on Mars in 2025. http://www.mars-one.com/mission/roadmap

In the realm of the feasible, SpaceX plans to land people on Mars in about 25 years.

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