First of all Cobol is actually quite widely used for legacy systems.
As as been covered frequently Tiobe is a poor indicator of language popularity especially for Scala. e.g. capecoder.wordpress.com/2012/04/09/language-popularity-its-not-about-search-engine-result-counts/
As as been covered frequently Tiobe is a poor indicator of language popularity especially for Scala. e.g. capecoder.wordpress.com/2012/04/09/language-popularity-its-not-about-search-engine-result-counts/