I'm not all about the one man on one planet thing either. In fact...well, nevermind.
But humanity, or something like it, has been around for a very long time, and regardless of whether it continues to look like its current form, it will probably be around for a very long time, even after Earth ceases to exist. Some of the greater forces in the universe have taken an inordinant amount of interest in our little planet (and in a small, specific group of people on it), and I don't think it's too much of a stretch to say that if there is a greater force than those greater forces (er...right) he/she/it might be just as interested in our little planet and the billions of people on it as any other planet and the humans/aliens/sentient plants on them.
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But humanity, or something like it, has been around for a very long time, and regardless of whether it continues to look like its current form, it will probably be around for a very long time, even after Earth ceases to exist. Some of the greater forces in the universe have taken an inordinant amount of interest in our little planet
(and in a small, specific group of people on it), and I don't think it's too much of a stretch to say that if there is a greater force than those greater forces (er...right) he/she/it might be just as interested in our little planet and the billions of people on it as any other planet and the humans/aliens/sentient plants on them.