yeah lots still use it, but it's not the first choice for communication anymore (except amongst older folks)
Well no kidding. Within an inter-office environment, you're going to communicate with others within that framework.
My business deals with clients outside the confines of my office space - getting them to join our inter office methods would be ludicrous. I can imagine the look on the head of a hospital's IT if I said, "Just text me with the info, or better yet, Facebook message me. What's your instagram handle?"
Yeah, email is not going anywhere soon.