Wilbur has a list of technologies on the way out.
Following in the footsteps of Blockbuster, Sears, Nokia and BlackBerry, and many others, CDs and DVDs are dying.
Let me call this one a few years before it happens. Hard disk drives. SSDs are more expensive, but more than 80-percent of all Macs use SSDs instead of hard disk drives.
Almost gone already? Anything else?
Slow downloads. 4G LTE at its best will not rival what is coming in 5G. Assuming it will make it before I retired. There are hurdles to overcome and rivers to cross but 5G could and should eventually hit gigabit speeds and when it does our brains will merely rot on YouTube videos faster than today.
Probably. Speed kills.