Hmm I have mixed feelings about this. Assuming we have progressed far enough to no longer fight over imaginary friends, relying heavily upon limited resources, and overall less dick waving then I will be ok with it. If we are still as heavily reliant on "my god is better than your god!", eating up resources like crazy, and a constant battle of one upsmanship then we deserve whatever may befall this planet.
To those that think we can just go all crazy with colonization, who is to say that the native species isn't already more technologically advanced than we would be? That fight would be akin to trying to use spears to kill guys with M16s.