Yes, it is possible to remove the community wiki status of a question.
However, it is a very rare thing to do. I've done it in the past when someone has made too many edits to their own question or they've been the "victim" of several other users making essentially duplicate edits in a short period of time.
As for your question:
With more than 15 answers (20 in this case) posted, this question is tending to the "not constructive" and the CW threshold on the number of answers is designed to reflect this.
Questions with many answers are an indication that they are not a good fit for the Stack Exchange question and answer model where there is supposed to be a few "correct" answers provided.
If you are getting many answers then this is a sign that the question is inviting discussion and debate. If you check the "not constructive" close reason you will see:
This question is not a good fit to our Q&A format. We expect answers to generally involve facts, references, or specific expertise; this question will likely solicit opinion, debate, arguments, polling, or extended discussion.
I'm not saying that this is true of your question, but it is generally true. If we change the threshold then potentially more bad questions will be left on the site.
In my opinion the CW threshold on other sites is too high - it should be 15 answers network wide (except for perhaps Code Golf).