The next big step in computing is gunna be quantum computing.
There have been a lot of 'next big steps' talked about but not many have actually surfaced.
[Memory lane on.]
RISC CPU's, I saw that work!. A 12 MegaHertz 32Bit CPU outperforming Intel's efforts at the time. (Unfortunately it wasn't an Intel CPU and didn't have 'MS' support and so it was ignored).
Computer memory, using one single bit to have three different states, (instead of two), -1, 0, +1. (Same as above). This memory is a bit hazy in 'memory lane' but I know that at the time the developers were claiming that it would mean unlimited memory for your computer.
[Memory lane off]
All of the developements up until now have been limited by the 'backward compatability' that 'Intel' and 'MS' want for their products. This is good news for us at the moment but........ Soon we will hit a barrier where we can't have faster processors because of the heat generated and the power needs of the more powerful CPUs.
Computers are like cars. A car's engine hasn't changed in it's basic operation since it was first invented in the late 1800's, the way a computer works hasn't changed significantly since 'Babbage' in 1834. (A bit over the top but makes the point
.)