It’s hard to see what difference the amendment would make. Chinese telcos are all state-owned and their top executives are communist party officials, so there is no reluctance to cooperate with police and public security officials.
The same goes for domestic and foreign internet firms, as the 2005 Shi Tao case confirmed; the Hunan journalist was jailed for 10 years after Yahoo passed on his details to authorities.
New York Times speculates that the effect may be to make operators and ISPs more active in scrutinizing the data transmitted over their networks.
But there are some domestic critics - or at least one. Kan Kaili, an outspoken professor at Beijing University of Posts and Telecommunications, told the Times, “If the government insists on doing that, I would suggest they rewrite the Constitution. Otherwise, it is clearly illegal.”