Like if you look at the rate of down scaling it has slowed some. It's also not the size of the whole transistor it's the size/thickness of the N, P and Insulato

Like if you look at the rate of down scaling it has slowed some. It's also not the size of the whole transistor it's the size/thickness of the N, P and Insulator layers that will limiting factor in FET style transistors. The oxide/insulator thickness on modern process is pretty insane. For instance for the intel 14nm++ the silicon nitride and silicon oxide layers seem to 4 to 5nm thick. -Edit- For instance here is 2 fins for from the intel 14nm++. The grains/spheres you see this image are the atoms. Some parts of the a modern transistors are even smaller than process number may let you know. https://imgur.com/a/hgeSOVV https://imgur.com/a/hgeSOVV