Truth be told, I wouldn't be surprised if humans started terraforming other planets before this century is out. If we can figure out this climate change thing on Earth, that might lend itself to terraforming elsewhere. And I don't know but that terraforming Venus first might not make sense.
It's closer and thus presumably easier to get to, not to mention that the gravity would be the same. Could we genetically engineer some micro- or even nano- organisms that can resist Venus' 450°C weather long enough to shut down it's hyper-charged greenhouse gas atmosphere? Or will Venus' lack of a decent-sized moon make terraforming there ultimately futile? Maybe some combination of Ceres, Vesta and/or Pallas might be brought to bear to address the lunar issue, if one is needed to sustain life (as I've read in places is helpful at least). Of course one of those would probably be drafted by a Mars terraforming project.
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