Board Thread:Support Requests - Getting Technical/@comment-29804692-20160901093111/@comment-24473195-20160901095032

No, it will  probably never be activated for all wikis but is already possible only on a per wiki basis, and you have to request that it be activated.

Also, as this is quite a big risk for wikia they don't just randomly activate on all wikis because commons does have extensive collections of porn and illegal material from time to time.

Another risk is if commons admins delete all the images you depend on for whatever reason, you'll end up on lots of  red links once the cache is refreshed.