As a moderator, I wouldn't outright close it, but if it got 5 close votes I wouldn't reopen it either. The rest of my answer below applies to borderline questions such as this and some possible ideas for approaching how we treat questions, answers, and ways to possibly lower the barriers to entry into the PMSE community without sacrificing quality. See below for more details:
Subjective Questions and Real Answers
I really think Aarthi is onto something here in regards to focusing more on the answers. One way to do this is to focus more on the back it up rule as well as in migrating the table in What is an acceptable answer from Meta Stack Overflow and adapting it to fit PMSE Meta.
Subjectivity is part of PMSE:
The fact is, parts of PMSE are subjective in nature, and some esteemed members of our community have made it clear that they value such questions. Therefore, I believe we need to focus more on making sure we write really great answers and cut down on answers that don't meet the guidelines, such as comments as answers or answers that fail to explain "why" or "how".
Next step, decide what is and isn't a valid answer:
I believe the next step in our community's growth is to decide exactly what is and isn't a valid answer on PMSE and enforce that rule as a community. For instance, if we're not going to post more than a sentence or two, one possible rule could be to either don't post it, or leave it as a comment. Most answerers aren't first time Stack Exchange users. We know the drill. Therefore, by being more disciplined answerers, I really believe we can give question-askers a bit more leeway and make it slightly easier for new and existing users to post questions.
After all, a single question can lead to 3, 5, or 10 possible great answers; the questions are the valuable seeds that help our site grow.
Answers are easier to improve than questions:
Most of the time when I leave comments on answers flagged as NAA (Not an answer) the poster is able to edit the post and improve it. In my experience, it's much much easier to improve your answer than it is to improve a question. Also, if your answer isn't all that great, you can just remove it. If it's just a sentence or two, it's probably not going to be missed amongst the other answers, so make it a comment and move on, or add more details. :) An answer is just a leaf on the tree, whereas a question is part of the tree's roots and trunk. Answers, like those leaves, just cannot exist without the core question.
Don't get me wrong; this isn't to say answers aren't valuable. They are! But treating questions like gold may be what we need in order to encourage more question-askers to join our site.
I'll work on moving over the table and will create a separate Meta post where we can discuss it and figure this out. :)
Here is the question: How should we adapt the "What is an acceptable answer" post to fit PMSE?