I think this misses the mark for two reasons. One is simply that these sort of questions aren't really the point of SO, but I guess people disagree.
A bigger one is that closing is no big deal. People can still read the question and vote on answers! The only thing you can't do is add new answers. And given that there's already a perfectly good answer along with a bunch of other posts, more answers would just be adding to the noise.
Seems like a win-win to me, but others somehow construe this as the downfall of StackOverflow.