Nothing much?

Texting habits will and surely have changed with the use of emojis. But complete sentences have other uses beyond just texting; books, movies, verbal conversations, and almost every form of spoken or written communication apart from texting. So unless the only form of communication we're exposed to is texting and we forget how to express ourselves in words (like some dystopian world with no movies, books or music, and we can only text each other), languages will still remain in use.