Nothing. The type of orbit we're in won't be affected by a weight shift onto one side for two reasons. 1) Earth's in orbit around the sun because the sun has a gravitational field, however, Earth has its own gravitational pull, so by shifting the weight to one side, Earth's gravity will just keep holding it together while it spins around the sun. 2) It would be spread over such a large area, that the vast surface area would be like just putting a gigantic sheet of paper over one side of the Earth. If everyone was all rolled into one massive person, that would probably throw Earth out of orbit sending us either hurdling into the sun, or into the vast depth of space, where we'd probably hit another planet in the solar system first. The change would be very slow though. Not to mention it would throw off the Earth's own rotation, thus screwing with Earth's gravitational pull, so we'd probably all just fall off the Earth and explode in the vacuum of space.