Cobol has way less market share than it did a few decades ago.
I'm kind-of puzzled how we'd even start to make such a comparison, given that "the market" for computer software has been incredibly diverse for decades.
Explosive growth in parts of the market that previously didn't exist, slower growth in parts that existed for many decades.
"Modernization was favored over the replacing and retiring of older systems with 63 percent of respondents choosing to improve upon their existing COBOL systems in 2020."