The killer of email, like with every method of communication that has gone mainstream and then declined, is spam. Not just spam as in fraudulent scams, though

The killer of email, like with every method of communication that has gone mainstream and then declined, is spam. Not just spam as in fraudulent scams, though those are pretty bad. Not just spam from companies you've done business with and neglected to opt out of legal spam from, though it's exhausting. Once a communication protocol gets a reputation as a consistent way to reach someone, with some level of urgency, a certain subset of the population lowers their threshold for what constitutes urgency until the signal gets lost in the noise. Not sure how to fix it.