Let's look at this from a logical point of view. The 2020s is going to be the gadget era where different technologies will develop to be used widely. Smart watches, VR, AR, drones, robotic hands and prosthetics, holographic TVs, AI, Robots (Boston Dynamics), implants. All these technologies got developed by 2010,and became a standard in the 20s. By 2030 these technologies will be mastered and will be used by everyone without any flaws,so the logical step would be bug free versions on each of them without any lag and delay. By 2030 all these technologies will be billion and even trillions worth in the stock market,so looking right now at each and every one of them I suspect that by 2030 we will see the first implants in the market,such as brain implants. Prosthetics and robotic arms will be used by people without arms and by different sectors such as cooking or in hospitals for critical situations where the human touch will only be overlooking the procedures (examples would be brain surgery,or any type of surgery). Also these technologies will take time to be bug free and without any delays,so I guess by 2040 the brain implants will be used without any delays as well as prosthetic arms. So by the same logic somewhere around 2035 there will be the first choice for us to upload our memories into the cloud,but this version will be in it's infancy and it will take a few years to have no issues when people will be using that so I guess Ray Kurzweil was right all along,2045 seems the greatest possible scenario for technological singularity judging by the pace of the technological growth as it is right now. Maybe if things speed up even more once we have AGI,I guess we could even see that by 2035 which to me sounds a bit ridiculous,but hey..who could have thought that we would have an AI as powerful as Bing AI by 2023?