There are millions and millions of lines of old COBOL code. I’m surprised there isn’t a commercial “pluggable” transpiler product. Read in COBOL, output Java, Rust, Go… Many COBOL systems also have a lot of intelligence in the job stream order, and dependencies - so that needs to be converted too. This seems like a no-brainer to build a consulting practice and tools around. Oh, and the data has to be converted too.