I would also expect that God would leave many of "us" behind to take care of the mess we have made on behalf of anyone left!
No, in fact, that's
exactly what the Rapturists believe - that the Rapture will cause the deaths of potentially millions of nonchristians, as Christian airline pilots, drivers, and others in crucial positions are suddenly assumed into heaven. It's all there in the Left Behind series of books, which are sort of the Rapturist's Bible Companion.
Personally I think it's an argument - a humerous one, of course - against allowing Christians into any sort of position of power, authority, or control. If they're apt to disappear at any moment, it endangers the rest of us to allow them to be pilots, allow them to drive, allow them to be in charge of anything.