What exactly would you replace SIP with? Hangouts? Skype? Another proprietary OTT solution? Please, no.
Are you confusing SIP with the public switched telephone network? They are two very different things; SIP can be used to signal PSTN traffic, among many, many more things. "Killing" a completely open, functioning communications standard just because it doesn't share the same acronym as the hotness of the moment is extremely shortsighted.
I do agree on two things: carriers should not be in the business of providing services on top of last-mile delivery, and any said services really need to be modernized. Eg, provision public URIs alongside phone numbers, let my phone register with my own SIP proxy rather than the carrier's IMS gateway, QoS guarantees for video calls and other media, etc.
Are you confusing SIP with the public switched telephone network? They are two very different things; SIP can be used to signal PSTN traffic, among many, many more things. "Killing" a completely open, functioning communications standard just because it doesn't share the same acronym as the hotness of the moment is extremely shortsighted.
I do agree on two things: carriers should not be in the business of providing services on top of last-mile delivery, and any said services really need to be modernized. Eg, provision public URIs alongside phone numbers, let my phone register with my own SIP proxy rather than the carrier's IMS gateway, QoS guarantees for video calls and other media, etc.