Wikipedia is more vulnerable than you think, there are only around 840 administrators on the English Wikipedia, most of them who have been around for nearly 20 years. It would only take a few takedowns of major admins to disrupt the power balance on Wikipedia to a different viewpoint. The next level in the hierarchy, bureaucrats, only have 16 members. Many administrators, including one quite recently got demoted for conflict of interest editing on Wikipedia. Some of the other language Wikipedias already had their administrator's imprisoned by governments.