If to you brain-computer interfaces also include AR/VR, then in that sense only I can agree that they are probably the future. However, you are wildly overesti

If to you brain-computer interfaces also include AR/VR, then in that sense only I can agree that they are probably the future. However, you are wildly overestimating how near brain-computer interfaces are if you think they will obsolete smartphones in 15 years. My prediction then is this: screens on fixed devices (desktop, laptop, phone, tablet, probably other form factors) will remain the most common way of accessing the majority of our computer use for the next, say, 50 years. They will not be displaced by glasses-mounted displays, though "smart glasses" will become a more and more common secondary device in the coming decades, just like smartwatches. The only thing that will displace regular screens will be safe, high-bandwidth, high-fidelity brain-computer interfaces - which is where the 50 years timeline is coming from. And I believe even 50 years is optimistic given the difficulty of making such a technology mass-market.