On a civilizational time scale, I just don't see the whole human race deciding that "ohh nooooo, the pwecious pwecious native microbes might be disturbed if we go there" holding up for very long. This is far, far from the opinion of the entire human race right now, despite how common it may seem on HN. At most it'll be a funny footnote that the school kids learn about in their orbiting space station schools where they'll laugh at what the funny old groundpounders thought, before the Earth became uninhabitable after the asteroid pounding given to it in the Great Space Indepedence War of 2343.
In evolutionary terms, it does not seem to be pro-survival attitude.
