We need stronger privacy laws to stop these activities rather than trying to circumvent them ourselves. There are plenty of ways to track people (tracking cell phones via bluetooth beacons and wifi network pings, for example) even when credit cards aren't used.
> We need stronger privacy laws to stop these activities rather than trying to circumvent them ourselves.
This assumes that the government can be trusted to care about the citizen's privacy. This is an assumption that at least cypherpunks explicitly do not share. Just find some case involving terrorism or child abuse (depending on the political climate), and new surveillance laws will become passed.
The point is that the very design of Bitcoin forces the entire transaction history of the medium into every hand that uses it (and can be obtained by anyone who wishes to examine it).
You can pass all the laws that you want, but that will not change unless you redesign it.
