It is a lost cause, here is no room for voice only connections. Enacting that technology would actually set back bandwidth use, not set it forward. The world has a limited amount of bandwidth. During the first part of this century, we thought we could never use it all. In the last few years, we are learning we can. Today it is all about getting the most out of the bandwidth. Let me try to break it down. You typical phone call, depending on location, type of phone, and service, take about 8 to 17 kbps at 1.25mhz. Your typical video chat, once again, depending on place, phone, and service, can take up to 100kbps or a 3xmc connection at 5mhz. The future is about using the same bandwidth for faster speeds. A rough example. You get about 31kbps at 1.25mhz for you cdma voice on the phone.
If you convert that bandwidth over to lte or wimax and do voice over interent calling, you cant use less then 6kbps of connection and convert that 1.25mhz to about 2Mbps data speed. . So you can have 1.25mhz offering only voice at 31kbps, or you can have 1.25mhz offering voice and data at 2mbps with wimax and lte. Now lets say you are going to convert the 100kbps 3xmc at 5mhz.
Well with wimax and lte, you could get up to a 21Mbps connection for data, voice, and video chat, for 5mhz or you can have that same bandwidth offer only 100kbps at cdma. You can take the bandwidth of all voice/texting/video, which is about 10mhz, with cdma, that will get you about 150kbps of data line using cdma technology. OR. You can convert that to wimax and lte, use the 10mhz and offer up to a 50Mbps line. With Voip and Vcoip, you can use less then 30kbps. Leaving 49.7Mbps of data open for anything you want.
Why would you want to use more bandwidth and get less functionality and speed? Same bandwidth, 150Kbps vs 50Mbps. Dialup vs fiber optic speed, your choice.