Wikipedia is actually a tertiary source of information and are not meant to be used for research. Remember that Wikipedia cites most of its sources, so instead of using a link to Wikipedia, the author can edit their post to include a link to the original source.
However, there are enough users on our site with the privilege to edit posts. We would just need to edit the answer to link to the primary source rather than to Wikipedia. Fixing this would probably take a minute at maximum.
That said, Wikipedia isn't that reliable, and in most cases it clearly mentions that the content there isn't "cited". In those cases, we can be pretty sure that the content in the answer is of dubious origin and is certainly not reliable.
My suggestion is that, whenever the Wikipedia article linked cites that the content might not be valid (with the "citation needed" Wikipedia banner), let us also use the "Citations needed" banner on our site. If the paragraph does contain valid sources, then let's edit that answer.