No, a computer monitor is not enough. It's one thing to watch something on a screen, it's another to be in another world or environment. Also, you can't socialize much using a monitor. The most you can do is use text messages and awkward videos. With VR, you can interact with other, as if you were in the real world, while walking in some street in ancient Rome, or cruising on a ship traveling through the human body, or the solar system.