Ignore hypotheticals, look at history. Say you have a network and you decide that voice calls are so important you should have (real) 5 nines reliability, backup generators, redundant capacity, the works. Now let's say that people start using this voice network to send data. Let's say that people start using other networks for voice traffic. Let's say that people start sending voice traffic as data. Let's say that people start using other forms entirely where they would have used voice (even for extremely important business and personal uses).
How do you decide what gets priority? How can you even know?
This is what has happened in real life. People started using modems on their land-lines. People got rid of their land-lines all together and used cell phones or voip as their sole voice line. People started communicating and doing business via email, text message, even facebook. Million dollar deals have been hashed out over blackberry messages. Relationships have been made and ended over IRC and SMS.
Meanwhile, the land-line voice network is orders of magnitude more expensive to operate even as it has become less relevant, because we thought we knew how to prioritize communications.
How do you decide what gets priority? How can you even know?
This is what has happened in real life. People started using modems on their land-lines. People got rid of their land-lines all together and used cell phones or voip as their sole voice line. People started communicating and doing business via email, text message, even facebook. Million dollar deals have been hashed out over blackberry messages. Relationships have been made and ended over IRC and SMS.
Meanwhile, the land-line voice network is orders of magnitude more expensive to operate even as it has become less relevant, because we thought we knew how to prioritize communications.