Yup!
There are many, many protocols for exchanging messages, chats, files, etc. (basically, what e-mail does), they all come, get some traction, last for two years, then die (except maybe irc, but except for a few nerds, it's hard to get anyone on there anymore). Some get killed by google, some just get replaced by "the next new thing"... but e-mail still lives, and works, and does what is needed.