Gordon Moore said Moore’s law would have to end sometime in the 2020s as silicon transistors approached the size of individual silicon atoms, below which they could not be made significantly smaller.

“And even Gordon Moore himself said, oh yeah, Moore's law isn't going to last forever.”

“Moore's law has to stop sometime in the 2020s because eventually you get down to the size of individual silicon atoms and you can't really make transistors out of silicon that are significantly smaller than silicon atoms.”