I have a couple of problems with your question. First, since I haven't posted here in a while and people may not remember me, let me say that I am an atheist, and not a theist. That having been said:
The Earth isn't about to die anytime soon. It was around for millions of years before humans walked the earth, and is (if I remember correctly) going to be for several million years more before the Sun blows up. Pretending for a second that an all powerful God does exist, what makes you think that he's forgotten about us (speaking solely from a planetary/astronomical viewpoint and ignoring the countless other indicators)? Several million years is a long time from now, and certainly more than enough time for an all powerful God to swoop in and save us from total annihalation (sp?).
Beyond that, what makes you think that our hypothetical God didn't give us the tools and abilities to save ourselves? Do you think that human technology is going to suddenly stop just short of intergalactic travel?
My knowledge of astronomy is very shaky at this point. Is it definite that life cannot exist anywhere else in the universe? Or is it just that we haven't found any yet? And frankly the fact that we're here does not necessarily mean we could be no place else, if you mean in the sense that life couldn't have developed the same way it has here. The universe is big. Do we really know that there is no chance of another earth like planet somewhere out there?
I'm skipping these, because others are already discussing them here. I simply wanted to comment on what I already have.
Marc