Priorities ...
Here in California where they "have hands free" laws they could start enforcing the "hands free" laws. Put a cop on any busy intersection and he/she could be handing out tickets all day long for people using their cell phone (cell phone in hand). The problem is that it's not about safety as much as it about raising revenue and the tickets for such an offense are quite low (first offense is $20) that it's not "worth it".
This proposed new rule is just the usual knee-jerk, not well thought out, reaction by politicians. Instead of forcing manufactures to build in a scrambling device, why not just have them install a Bluetooth device? The answer is probably something along the lines of that the politicians at hand have an "interest" in a scrambling device manufacturer.