Before I can answer your question, I have questions and comments.
I have been a member of WikiTree for just over a year, I decided to put my family history on WikiTree because family members were unable to access the family history on Ancestry. I have been actively researching family history for 10+ years. I don't know a lot about many of the tools that are available on WikiTree. All of the profiles I have created are sourced, though as I have been recently reminded, they don't have inline sources and many do not currently have online sources. They do have named sources with enough information to find the source. It is a work in progress.
Some questions: knowing the answers would help me make suggestions about The Year of Accuracy.
1. How many active PMs do we have, there probably is an official definition, I think that someone that has not contributed anything in 12 months is not active. In that case the profiles they manage should be orphaned. The original PM can still edit those profiles if they return to WikiTree.
I recently adopted almost 200 profiles that a distant relative created by Gedcom upload in Jan 2012, they had not been edited since that time. I have all the needed information and more than enough sources to create Genealogically Defined profiles but it takes time to do that.
One of those profiles was recently edited by someone who added unsourced inaccurate information copied directly from other online trees. This does not help.
2. Do we have 'an exit interview' for members who decide to leave WikiTree? As opposed to those who retire from active involvement after a number of years.
I have seen a number of G2G posts where members complain about 'other people messing with my tree' and they leave because they don't understand a Wiki.
3. Do we know why people join WikiTree? Do new members think that WikiTree is the same as many paid sites, but it's free?
4. Do we have any idea if the profiles on WikiTree are better than the equivalent on other paid sites? Judging by the number of completely unsourced and copied trees on other sites I hope we are better.
Re Judy G Russell, the Legal Genealogist, said this a few days ago
What Wikitree has me linked to as "my" family is laughable. And getting worse every day.
If we are going to use this as an example and something that needs fixing in order to make a public example of accuracy, we need to know what Ms Russell sees as inaccuracies. Is WikiTree the only site to have a family history accurate or not for Ms Russell or are we the only one that has an easily accessible tree?
5. But are we the current active members thought to be held collectively responsible for the accuracy of all profiles?
WikiTree actively encourages members to provide sources for each and every profile they create, however enforcing this I think is almost impossible.
While many WikiTreers are intent on creating accurate profiles with proper sources, my gut feel is that most members just want a place to stash information about their ancestors, even if it is only based on what great grandmother Maggie said. They aren't interested in doing collaborative genealogy
I note the comments made by W Robertson about last edit dates.
There are 119 last edited in 2009 - https://wikitree.sdms.si/default.htm?report=srch1&Query=lastedit2009+open&MaxProfiles=500&SortOrder=BiDa&PageSize=500 -- so we should be able to do these
More daunting is 2010, which has 71,388 last edited in that year - https://wikitree.sdms.si/default.htm?report=srch1&Query=lastedit2010+open&MaxProfiles=100000&SortOrder=BiLoc&PageSize=500
6. Who are the people who will improve these profiles? I know that there are individuals and groups that work on profile improvement; this is a huge task.