Yep (w00t)
I mean, eventually, we will travel to other planets, but the humans that colonize the new planets will evolve according to the nature of the planet. so would they be human after all that time?
(i.e. settle on a desert planet, start to look more like camels, large nostrils, massive eyelashes, big hump thing to store water, they would be much thinner due to less fat.)
So in the end, as soon as Earth is destroyed (one way or another) humanities doom is certain.