What is microprocessor scaling?

Answer 1

Should be more specific with the question.

Could mean transistor scaling where they make the transistors smaller and smaller. Today's industry has no problem with this.

Could mean wire scaling where they try to make the wire connections between transistors smaller. This is the bottle neck of it all. well most of it. There are other issues. Today most use cu as the wire. Wires are at about 25 nm in width. the problem is that it difficult to go any further. There are problems with Cu because it a fast disfusser where it will actually spreads into the silicon. A 8nm layer of insulation prevents this from happening. As they continue to shrink the copper the resistivity goes up. This where they use repeaters. Repeaters allow to keep performance increasing at the same time consume more power. It is assumed that 15nm will be the limit and everything will fail beyond that.