Some Futurists predict the end of smartphones by about 2030

Paul Saffo predicts that robust AI-based voice recognition will enable wearable devices that mainly do not have screens to replace smartphones.
Even better versions of Apple SIRI and Google Voice over the next few years will let users discovered what they knew all along: We would much rather talk than tap. Driving directions were so much safer when spoken, allowing drivers to keep their eyes on the road. Tweet-sized quips were now uttered by AIs mimicking the voices of the celebrity dead. Even commerce will become voice-based.
Robust voice eliminates the need to design around screens, just as touch-screen technology once pushed out keypads. Communicators will shrink to the size of hearing aids, and their functionality melted into everything from eyeglasses, watches, and jewelry to vehicles and appliances. New functions such as breathtakingly accurate real-time language translation appeared (think Babel fish in Doug Adams’s Hitchhiker’s Guide), making these tiny devices essential and constant companions. Screens remained, but only as marvelous peripherals, not the center of communications activity.
Techcast is forecasting virtual reality around 2019 and more powerful virtual assistance from better AI.
There should also more robust gesture control from new versions of leap motion.