Harshax: This, seriously. Remember when motion control was "the future of gaming"?
Nintendo did ok with it as an innovator, but how'd that go for Sony? Oh, thar's right...
Randalator: Why would you want to buy a VR set in 2019 when the whole idea is dead and buried (again) and Smell-O-Vision is the next big thing?
You jest, but at the Game Developer's Conference I went to in 2001, one of the vendors was trying to sell this exact thing. Then they learned the hard way that given where games are often set, no one want to smell the inside of an alien autopsy room, a sewer, or a freshly-used bathroom.