HTML5 might not be right for every organization at this point. Whether it's justified for a specific situation requires detailed knowledge of end-users' browsers, the parts of HTML5 used, and an organization's goals for its Web presence. No practical applications yet use all of HTML5. The compatibility of the parts you need, with the browsers your end-users run, and your server-side technology, is a matter for thoughtful consultation.
But, it's safe to say that now is the time for most development shops to adopt HTML5. Cameron Laird in this article asks the developers to start taking advantage of its four powerful benefits. Faster image downloads, Improved SEO, Sophisticated animation effects and Easier Web app development are the qualitative advantages that HTML5 offers.