I hear that e-mail is becoming passé. This is probably what is killing it.
I agree with that assessment. My two spam filters are effective, but sometimes they are too effective. Last week they deleted an e-mail from a governmental agency that I had specifically asked to be sent. Only the telephone and that old standby, the "fax," saved the day. E-mail may be around for a long while yet, but it is becoming inceasingly unreliable and passé.