>>Can you count the number of times an internet connection has gone down for a business, compared to the number of times the PSTN has gone down?
I will give you that point, but counter with this: fax machines rely on printers, which IME are one of the least reliable pieces of technology. A printer being jammed/broken is far more common than losing internet connectivity.
And business people nowadays can check their email on a cellphone. Even if they don't, the email will still be there when they get back online. A mangled fax or one received when the power's out can be permanently lost.
I will give you that point, but counter with this: fax machines rely on printers, which IME are one of the least reliable pieces of technology. A printer being jammed/broken is far more common than losing internet connectivity.