I actually do not believe that Email is in danger of becoming a legacy media anytime soon, mostly due to the education system’s dependence on communication via Email. Email, although an electronic form of communication, is much more formal than texting, group messaging, or talking through Twitter/Facebook. Email maintains a level of professionalism within the student/teacher relationship that other media cannot.
However, because students are so used to informal communication via social media, they have a tendency to use Email in the same way. This leads to Professor frustrations, as they expect Email to be used in a more respectful and professional manner. I know for me personally, and for some of my friends, drafting an Email to a professor can take a while. It’s important to address them in a respectful way, while also being specific about the reason for Emailing. Especially in college, Professors expect to be addressed in the correct way and given adequate information, because they teach thousands of students.
I do think that Email will continue to be the best way for students and teachers to communicate. A professor communicating to his or her students through text just seems inappropriate. As of right now, Email is the best form of media that maintains professionalism.