Up-votes! - While I love the utility of having chronologically organized posts, and appreciate how this aids in understanding the progression of discussion, I wonder about adding upvotes - possibly under an alternate, toggle-able discussion view mode.
-empower users to raise awareness of a particular comment/idea. This may be significantly more valuable in a wiki with "numerous" (to a human, "innumerable") pages/topics, and with frequent posts, allowing for something like a collective attention span.
-encourage users to collectively revisit a subject. i.e. posts may become relevant/reviewed as needed, despite chronology.
-encourage more user engagement and curatorial responsibility. Many wikis are reference-based and function as a communal utility. Some, however, may have a more active, research-based, or otherwise participative orientation. Upvotes would be extremely helpful for these wikis to self-organize attention outside of the structure of the site (pages, topical division, etc)
-corrupting a relatively pure-to-concept discussion forum with metrics of personal value - (likes, reposts, upvotes)
Curious as to people's thoughts on this!