Originally Posted by
Alexandros
Spoiler: The timeline follows the commonly-seen-in-movies paradox that basically the future affects the past so that the future can happen. So we do actually see the "original" timeline, even if this word is pretty meaningless in this case. If Murphy hadn't noticed the dust patterns, Cooper wouldn't have found NASA and travelled to space and thus wouldn't have caused the dust patterns etc etc. As for humans making it to space stations, the main hurdle for that was the lack of a gravity drive that would be able to send a huge amount of mass (people and big spacecrafts) to space. Since the equations were solved through the transmission of data from the black hole, the rest was relatively simple I guess.