I suspect that God would have eventually granted Adam and Eve access to the forbidden fruit - when they were ready. It's like if I told my 11 year old "don't drive the car, when you're old enough I'll teach you." Now, if he snuck out and drove the car anyway, you better believe I'd punish him, and I don't think I'd be an a-hole to do so. Interestingly, in the Genesis account, after they eat the fruit, God says, "now lest they take from the tree of life and eat and live forever..." and He kicks them out of Eden - why so harsh? Well, since the curse of sin would have been an eternal curse for an immortal being, God spared them that by denying them eternal life at that time. But even as He kicked them out, He promised a savior (the Seed of the woman in Gen. 3 - hinting at the virgin birth even); once Jesus took care of the sin problem, eternal life became an option for humans again (note that one of Jesus' titles is the "second Adam"). Just speculation, but I believe in Eden they had access to both, what we would call, the spiritual and physical realms. Now, I don't think the "spiritual realm" is all ethereal and magical... I think it's just as scientifically real as what we call the physical realm - it is just in dimensions that we don't have access to. After the fall, humanity was cut off from those spiritual dimensions and we can only access the physical in this life. When we die, it switches. We loose access to the physical realm, but can then interact with the spiritual one. At the Second Coming, I believe Jesus will set things right and we will have access to both once more.