In VR that depth of field is created by having an object be X distance away from the two cameras. In real life that depth of field is created by having an object be X distance away from the two eyes. Thus, VR is 3D.
You can still perceive the 3rd dimensions with only one eye.
Then you have a super power! Joking aside, I recommend an experiment. Have a friend or family member stand a few feet back from you and hold a glass at about your eye level and move a quarter back and forth above it ("back and forth" meaning closer and further from you). The challenge is that when you say "drop" they drop the quarter. Try it 10 times and see how often you land in the cup. I think what you'll find is that you have no depth perception with only one eye.