I'd ask here how a bill can be a "beachhead" against encryption when it forbids the government from even requiring that telcos adopt equipment for which wiretaps are feasible, and when it specifically exempts telcos from being required to facilitate decryption.
That doesn't look like a ward against anything, to me. It looks like a compromise stuck into the bill because of push-back from "cypherpunks". If the political winds had changed, or change in the future, that part of CALEA would be removed by a new law.
I think most politicians have no problem banning strong encryption and mandating ISP decryption of it all. Even most citizens have no problem banning strong encryption.