It has recently been said that “the Flash Player was not going to achieve the same ubiquity on mobile as it has on the desktop.” He also added that (and mainly points out), since HTML5 is widely accepted across all platforms, and the fact being that Apple’s iOS is not going to allow Flash in the browser, it is very much understood and observed that the tool will never achieve the same universality on mobile as how it achieved on the desktop.
It’s a known fact that HTML5 is universally accepted and supported by most mobile browsers, and having a strong base with strong support on smartphones and tablets, this enlightened Adobe that Flash would never be able to compete with the latest standards of HTML. This is one of the main reasons why Adobe decided to kill Flash, and as Mike stated – Adobe is now more focused toward HTML5.