"The US government" is not a monolithic entity. Certain departments (e.g. NSA) might "log everything" already, they just don't (or can't) share it openly with other departments yet -- if anything, because revealing such capability is damaging in itself.
If I understand correctly, from some news I read [1], they are already sharing information with at least the DEA and the IRS. The DEA and the IRS were told to cover up the source of that information by coming up with their own independent leads to recreate the information obtained ("Parallel construction" is really intelligence laundering).