Web IS about blue links, images and primarily - text. More 3D for what?
Conversational interfaces will grow in numbers but this is not really web's question but AI, ML.
My vision of Web 3.0 is not much different. Web will become a personal assistant and an open global network could be used without any devices. People will simply ask (or just think?) what they want and machine will do the rest and in some cases AI would be able to predict what wou will need in the nearest future.