StackOverflow has several subjective/poll questions that do not have an answer (by definition), I wish there was a way to let SO (and other community users) understand that there is no right answer to the question?
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
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99% of the time, if you have a question that doesn't have a "correct" answer possible on it, then at the most you should be making it Community Wiki, and more likely you shouldn't be posting it at all.
Since CW questions do not affect reputation and has no negative effect on anyone directly, even when accepting an answer I don't see an issue with the problem. I see no need to define this even further as it is covered fairly well in the FAQ already.
Also as balpha already pointed out, it does not affect the acceptance rate.