A Much Needed and Well Overdue Nap

The Universe is constantly expanding, but the world isn't. And the human population is. What will happen if there's too many of us? the other day I sat and wondered what would happen if there were so many people covering the surface of the earth that one couldn't even sit down without crushing a baby or a foot of some strange person you don't even know. Would gravity even put up with that sort of nonsense?
Everything has a limit, so either gravity would grow exhausted from the effort of holding onto several zillion people, or the crust of the earth would simply say something along the lines of, "Fuck it" and collapse under the pressure of a seemingly endlessly powerful force of gravity. If gravity continued to stand faithfully oblivious by its post even after the collapse of the earth's crust, then the end result would look something like a mass of melted crust, humans, buildings, animals, and steam. The reason it would look like such is because it would quite literally be such.
The other option for gravity at this point would be to agree with the earth's, "Fuck it" decision and let go as well, at which point space would suddenly be filled with tiny imploding, exploding, and screaming humans and animals. I can't imagine the buildings would complain much; they're already used to being walked all over.
So it appears that even if we don't rape the earth of its resources or kill each other with wars over those resources, or if our star(sometimes called, "the" sun...don't know why we act like it's so important though...it's actually one of the smallest stars in the universe) doesn't die of old age or kill us with the same energy that keeps us alive, then we are bound to kill ourselves anyway by simply living. There's some iron for your diet.
Now imagine for a moment that gravity is on steroids and has chosen to split the steroids fifty-fifty with the earth's crust-as if the surface hasn't gone through enough abuse already-and both manage to sustain the ridiculous pressure that is literally a mass of humans covering the earth's surface. The only plausible thing to happen is that many would die of mass disease and starvation due to the inability to move around much. The starvation would lead to cannibalism, and the disease would most likely lead to a zombie epidemic of some sort. Humans would eventually die out, and the earth would breathe a sigh of relief as the last most intelligent earthly organism passed into oblivion.
With a slight smile, earth would probably simply let loose all the stress of supporting self-centered, reckless organisms, and enjoy the peace and quiet, perhaps even uttering a little, "Good riddance." before taking a much needed and well overdue nap.