Green screens will still be a less expensive option, so yes, they will still be around. I do believe that this will be much more common for larger budget productions and will work its way into live entertainment.
The first big film that I saw that uses LED set was Gravity. Incredible technology, and superb film. It was a mix of both tech I believe. But I think green screens will be around for a while, as you say, they are cheap and easy to deploy.