>>150038596 (OP)
The method will live on, only among the insane, tenacious, determined or obsessive. It's not a genre, it's a medium, a tool, to express something you cannot through conventional means or text alone.
Just needs practice, and study like any other art.
I just wish more were willing to learn. Disney only has 4 "Ink and Paint" pros on staff. Mostly to either fix archival stock, or make collectable merch for private collectors.
Of course, nothing happens without investment or spending. Art is never "free".