To whom?
Rights are in place only to protect the minority against the majority. The majority doesn't need any rights because they can win any vote.
If the rights are in place to protect the minority against the majority, and these rights are left up to popular vote, what is the point of having rights? Who is being protected?
edit: by definition, popular vote will go the way of the majority, and if the majority are bigots, does that make it acceptable to codify their bigotry?