I'm sure there was pockets of people who thought 3D TV was the greatest thing ever, and look how far that technology has come. Alexa and Siri were once upon a time going to be the greatest things ever, until everyone realized how very meh the experience was in practice. Smart watches were similarly going to change the world and have since largely pivoted to being niche products for health nuts.
BTW, I'm not saying you're absolutely wrong! I just don't think there's any reason to believe you're right, either, and a lot of reasons you might not be, including sky-high costs, practical technology limitations, the lack of killer applications, social barriers to adoption (see: Google Glass), etc.