ArFaen
Here's a con... Install your gaming rig improperly and your head explodes.
Virtual Reality already exists and has existed for some time, for various levels of reality.
We can do touch, we can do vision, we can do full-body motion, there's no particular reason why we couldn't do they al together, though I don't know of any rigs that actually do.
But there are always bugs and glitches. And in a system that provides force feedback, those glitches translate into impacts against your own body. A sufficient glitch could kill or injure the user. Same with temperature control. Heat stroke or hypothermia could be caused by the mechanism. (a mechanism that could actually cause burns or frostbite, while possible, would be unlikely to ever be installed in such a rig.)
Rendering glitches and resultant flickering of the world around you can cause siezures.
I don't see 'addiction' as being a particular problem, since people still have to eat to live.
The right thing to do would be to have some sort of safety breaker on the thing. If it gets too hot, a switch would melt, cutting off current to the heat supply. Same with cold: if it gets below freezing, a switch would expand and snap. Etc.
Forceful impacts should not be installed in the game. I mean, I wouldn't want to play if I got bruses from sword fights. I once read a book where, in a Virtual Reality format, dying constituted seeing white light and a fizzy feeling. Something like that would make sense. Where you felt a tickling feeling or something, when something hit you.
There's risks in everything. Every day, you walk outside and hope a plane doesn't crash and land on you. Or a tree. Or that the sidewalk doesn't crack, and you don't trip and fall and break your neck.
Flickering doesn't always cause seizures, usually only in people with an epileptic condition. Of course, those people should never play video games anyways. It says so on the box.
The first game produced for such a system should be something like "Super Mario VR," where the worst thing you get is a poke or a nibble from a goomba, or you fall off a cliff into what feels like bubbling soda, then get retransported to the start.
Virtual Reality is what I've been waiting for my whole life, though. I really, really want it to be developed within my younger years.