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You will still need to copyright your work (or, to put it another way, rely on copyright) if you ever plan to enforce this license.
As it states in the overview to the GPL: "Developers that use the GNU GPL protect your rights with two steps: (1) assert copyright on the software, and (2) offer you this License giving you legal permission to copy, distribute and/or modify it."
Of course, that's one of the benefits of contemporary copyright, is that the content creator has a great deal of latitude in which rights to grant or reserve to the recipient.
That said, using the actual GPL to stipulate usage of a text isn't going to make a lot of sense, since much of the language in the license refers to software-specific elements (source code, warranties etc). I'm also not aware of any aspect in there which specifies a limited duration.
I think you'd be better off starting with one of the five Creative Commons and modify it if required. Legally, the GPL is no stronger or weaker than CC, in fact it might omit something critical since the language is not specifically targeted to creative content.
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