[toast0]

4g should survive better than 2g and 3g, because the 5g standard allows for mixed mode deployments where the coordination channel runs as 4g, and the slots can be 4g or 5g dependening on what the client device is capable of. Running the coordination channel with 5g encoding could be a little more efficient, but it's not a big loss compared to running a minimum size 2g/3g allocation.

[vv_]

EDGE and E-GPRS is going to survive for at least another 5-10 years. Although this statement might not be globally accurate.