Trying to stop this is like trying to legislate the tides and the weather. It contributed to the fall of the Soviet empire. They couldn't stop it either. Like every new technology, this comes at some cost. Cars pollute the air.
Cryptography can help criminals hide their activities.
People in the law enforcement and intelligence communities are going to look at this only in their own terms. But even with these costs, we still can't stop this from happening in a free market global economy. Most people I talk to outside of Government feel that the net result of providing privacy will be positive. These sweeping technological changes have big implications, but are unstoppable. Law enforcement and intelligence interests in the Government have attempted many times to suppress the availability of strong domestic encryption technology.