You need real world training for all of the above, but I'd be curious to see how the VR training could help people get started. I wouldn't buy a VR headset for any of these things alone, but combine it with games, entertainment, virtual workspaces (you could be sitting in a 10x10 basement, but feel like you're sitting at a desk in a penthouse overlooking New York), and I think they could be quite versatile, and a worthwhile purchase.
I can imagine big business in creating alternate reality assets, such as virtual homes. I wonder if you could combine the real world and the virtual world as well. For example, I'm building a new home, so I make a 20x20 room, dividing a 5x20 and 15x20 section with a sliding door. I put a bed in the 15x20 area, and a railing in the 5x20 section. There's nothing passed the railing, it's just a railing 2ft from a blank wall. However, I create a virtual world that matches the geometry. I put on the headset, and I can sit down on my virtual bed, or walk across the room and slide the door to the balcony. With the headset, the balcony looks like it's on the 20th floor, overlooking the ocean. I can lean on the railing and look down at the world below, while in the real world, I'm just wearing a headset staring at the wall in front of me. I could put a fan in the 5x20 room, so in VR, it feels like there's a breeze on the balcony.
It sounds a little crazy, but is it? You can turn an unfinished space, such as a basement, into a billion dollar VR dream home. There could be a VR home generator, where you enter the floor plan of your basement, and it generates a VR home with rooms and doors that match that space. I'm curious to see where things go, it'll be an interesting decade.