deloused brings up a number of good points. Certainly, the spoofable number can't be used for enforcement. And the "spoofability" should be maintained for the reasons you outlined. But it still seems insane (from my engineering perspective) that carriers can't identify the source of traffic on their own network. If a hundred people report spam calls that all trace back to the same source, then that source should be turned off. If that source is another carrier, then they should do the same in order to be reconnected. It actually shouldn't matter about the "who" behind the calls, just the network source (so I retract my previous requirement to identify people by credit cards, etc.)
I'm sure we could keep going around in circles. In the end it's not up to us to design a solution, and the telcos will have to if they want to maintain a functional network and keep their customers.
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