We'll get to 256 core server chips and that will be the end of the line. You are forgetting that the advertised version number denoted by nm is about what size a theoretical planar transistor would need to have to be equivalent to the advertised process.

Since that number is purely theoretical, we can construct a theoretical scenario in which its theoretical nature would become absolutely obvious. Take a 7nm process node transistor and stack it 100 times. Such a process would be called a 0.07nm process.