This is not the answer. Why don't we invent technology that beats the "supercookie" instead of passing laws that restrict innovation and ideas?
If you disable your browsers cache and/or JavaScript, I guess that would fix this particular issue.
If you want to keep both the cache, and JavaScript, then you need to stop people from doing this sort of thing, with legislation.
If we don't have a technical solution for a problem (which we don't in this case), then regulation is appropriate. If and when we find a technical solution for this problem, then the legislation will be deprecated. Until that point, it is useful.
What is "ridiculous", is assuming that all problems have technical solutions.