Well, isn't the question about whether colonizing Mars an invalidation of so-called "Bible prophecy" the subject at hand? There would have to be such a thing as Bible prophecy in the first place, no? If one can prove that there is no such thing, isn't that still part of the same subject? That was what I was doing (if you followed along from the beginning).
Only Christians like the JWs believe in such things as the Bible foretelling and mapping out the future of the earth. It isn't taking the OP off topic if one proves that there is no such thing to begin with.
What may be the problem is that there are some people I've met that want the JW concept of "Bible prophecy" to be real, as if the Jews really intended such a thing. But when you offer critical analytical data from Judaism to show that such a concept is of Gentile origin, that makes some people uncomfortable. Some people need the "Bible prophecy" concept to exist as an intention from us Jews in order to have something to "prove" their current convictions about how wrong "Bible prophecy" is.
There is no such thing as the Gentile concept of "Bible prophecy," ergo colonizing Mars doesn't invalidate something that doesn't exist. Christians made up the concept of a "march of nations" and a foretelling of the earth's eternal future being in Scripture.
At least for our Jewish Scripture, it has no such "prophecy," which is what I was pointing out. And someone raised points about establishing this, so I answered.
The OP raised a question about a concept that is moot because there is no such thing as "Bible prophecy." Colonizing Mars can't invalidate something only Fundies and JWs say is real.