The thing you are holding. Mobile or Laptop! Once had 5MB memory and called as a small miracle at that time. Now, 32GB-64GB! Well it has came to a limit now!
In last few Years, Computer and Mobile have become faster and cheaper only because of Moore's Law.
"Transistors per integrated circuit – The most popular formulation is of the doubling of the number of transistors on integrated circuits every two years." But At the end of the 1970s, Moore's law became known as "The limit for the number of transistors on the most complex chips."
In last two years, it is not possible to more tiny transistors.
The alternative options are:-
1) Quantum Computer
Which is still in labs and not born yet. It is still a model.
2) Neuromorphic Computing
This is the new approach to computing.
Watch this video to know more about it.