I saw that a new answer popped up to this old question:
I'm pretty sure that this question would be closed as off-topic if it were asked today, since it asks about real-world science, a topic that's repeatedly been accepted as off-topic. But it's a four year-old question, with many highly-voted answers.
However, there's no reason for it to draw new answers at this point, even good ones. My first instinct was to protect it, so at least we won't get new answers from random bypassers. Is this a good solution? Is this what we want to use question protection for?
Additionally, should we close this question so even higher-rep users won't contribute new answers to a question that is, at most, tolerated as legacy?