After Google Penguin update, many sites went down and so the company owners asked webmasters to leave ( thought that they don't know SEO) , this creating many openings in the market. Google is so nice helping real webmasters to get job by updating algorithm.
Its not purely true because number of website lost their ranking after implementing techniques bad SEO techniques to optimize website for search engine.
Not only just webmasters, but Ethical white hat SEO companies has gained more value.