Dying? I doubt it. While it's not the tool of the "cool kids" anymore, it Just Works, and it has gotten better in some important ways with the last couple of releases. I have to admit, when they started the whole 4.x thing, I was not a fan, and I do still think a lot of work went into making Eclipse more "web based" in a way that didn't actually add much value. And as result, the UI got buggy and it got slower and less stable. But at least with the Mars release, Eclipse works amazingly well. The performance is reasonable, most all of the plugins I want to use installed cleanly and work with no problems, etc.
The only real fly in the ointment to me, is something that isn't any fault of Eclipse itself. The Groovy/Grails IDE has not(last time I looked anyway) shipped a Mars compatible version, meaning I'm stuck using an older version of Eclipse for doing Groovy/Grails work. But that's mostly, as far as I can tell, a side effect of Pivotal dropping their support for Groovy and Grails.