Struts will never be a Sun-supported standard. JSF is and will always be.
Nevertheless Struts 1 is the most popular MVC framework. Searching for Struts-related jobs at dice.com today returned 2,253 jobs, as opposed to 693 jobs that require JSF skill. Since Struts 2 is much more powerful than version 1 (and easier to learn too), it is a logical skill upgrade for those currently using version 1. So yes, Struts 2 will be as popular as its predecessor.