It's amazing how being really good with a specific software can get you a ton of job. As the article said, business analysts who are experts at software like Oracle can get hired just because of that.
I actually know someone who unwittingly became an expert on a software that's widely used in her field. She's very marketable because she's so good at using this software, but that's not what she originally set out to do. She just learned it because she had to, and she ended up having kind of a talent for using it!