Force unethical means of tracking
Unfortunately, by implemening a law to prevent tracking visitors behaviour on a website using cookies (the only legitimate method) the EU are forcing website owners down the unethical route.
Those of us who operate in the EU are now at a commercial disadvantage with our US or other competitors and we will look for ways of redressing the balance.
Browser footprints are eminently trackable and unique and this is a steathy, backdoor, and probably controvertial means of tracking your visitors. It's already used by certain web analytics organisations and is more of a concern than cookies because it is not easily within your control as a visitor to stop. see (https://panopticlick.eff.org/).
In otherwords, introducing this law could in fact erode privacy it was intended to protect.