I feel like javascript will be here for years to come, it has come along way from its early years (still not perfect) and has the huge support of major companies and several more are breaking down and joining the javascript bandwagon, I think you will see that in a few years browsers will start to display everything the same, the mass user exodus from IE to firefox and chrome has kinda shook microsoft awake and they have been making progress this. Plus with frameworks like dojo, and bootstrap these make it easy to have the same interface on all platforms.
