So the tens of millions of people who use mobile and fixed line phones need to change the basis of their billing and absorb the costs of cold calls over which they have no control just so that the few tens of thousands of VOIP users don't need to pay for call forwarding? How does that make sense?

There is the additional problem that inevitably mobile providers won't pass the cost savings on to us by lowering the cost of making calls but they will bill us for receiving them so this is going to be an excuse to hike prices just like metrification was.