At the very least, you have to concede men have gone quite a ways to manipulating the environment they live in. As such, you have no way of knowing if we are not perfectly adapted to the environment we will build for ourselves from now on, and therefore can not credibly assert our far flung progeny will be any different than ourselves.
If you have overlooked such an obvious epistemological truism, what else might you have overlooked?
Not bad. That's a thoroughly entertaining thought experiment, but it's hardly a 'truism.'
Have you given your hypothesis a name?
How about “evolutionary perfectionism” or “evolutionary terminalism”?