People born with one good eye still generally develop depth perception. There is a lot of research into this topic, https://en.wikipedia.org/wiki/Depth_perception#Monocular_cue... has a good list of things that work just fine with one eye. But, it's not obvious how much of these are learned vs instinctive.
This is false, you can get plenty of depth information from a picture or even better a movie which is not stereoscopic.