I doubt GWT is dead, as some major Google properties are built using it, including AdWords.
That said, I really wish Google would work a bit more on polishing GWT. It's an amazing technology, but the documentation is woeful (the official docs have a lot of "docs coming soon"), and the UI out of the box doesn't compare e.g. to Bootstrap.
I don't really understand why Google haven't fixed this; I expect it's simply because it's not as interesting from an engineering point of view.
