This thread is a long one and is still being added to.
https://www.wikitree.com/g2g/282105/what-do-we-do-about-all-the-unsourced-profiles-on-wikitree-
Do we have an update since a number of changes were made to WikiTree including running the Project:Sourcerers#Sourcerers.27_Challenge , requiring sources, and adding the {{Unsourced}} template to many of them. There are also suggestions for the Data Doctors that target empty or mostly empty biographies that will include lack of sources.
So much (thank you) has been done to help solve this issue. Do we have an update on how many still exist?
Looking at the Data Doctor stats it shows
48,742 as of June 3 2018 of the 802 Empty profile
21,466 of the 803 Almost empty profile
Totaling 70,208 which is a huge reduction from the 210,00 in the original thread.
Additionally, there is the Unsourced list of these broken down by location
https://www.wikitree.com/wiki/Space:DBE_Unsourced
So if these are total figures it really shows the power of collaboration!