Never ... ok - never say never - well, probably not for a very long time. The cost would be prohibitive. Those NatGeo pictures were taken from a small low flying plane. The surface area of the Earth (land only - forget about the oceans - is about 57,000,000 square miles.) And if resolution were that good, then eveyone would complain that the pictures were all 50 years old because it would take a verrrrry long time to photograph the earth's surface at those resolutions before starting all over again.