Problem: Sister projects, especially large ones like the English Wikipedia, do not want to use Wikidata because it is prone to vandalisation. By exposing Wikidata to projects as big as the English Wikipedia, vandalism could increase sharply and human editors would not be able to keep up with reverts and page protection requests would overflow admins.
Proposed solution: An automated page protector bot or system that recognizes if a page is repeatedly being vandalised such as by tracking the number of reverts of edits made by inexperienced users and their ORES scores. It should then apply the appropriate page protection automatically after a number of identified forms of vandalism have occured.
Who would benefit: Everyone because using Wikidata has the power to significantly strengthen sister projects and the movement overall.
More comments: Not addressing the vandalism issue is a serious and cyclical problem that is holding back the huge potential for Wikidata. It goes like this: Wikidata isn't used much because it could be vandalised if exposed to the masses. Because it isn't used much it isn't vandalised and the tools to prevent it are not developed. We need to develop the tools to stop vandalism now so that other projects recognize Wikidata can handle it, and only then will they be willing to use it.