Though you might already know about, I thought I’d remind you about [Special:LicensedVideoSwap|Wikia’s Video Swap tool], which allows you to very easily swap out YouTube videos embedded across your community for the Wikia equivalent. It only effects YouTube videos with a matching Wikia video. Swapping out your videos for matching officially licensed Wikia videos means that the videos on your community are less likely to be taken down and rendered unwatchable.
With your approval, I can go through and make these swaps for you — if you’d rather undertake this task yourself — or if you’re uninterested entirely — just let me know! I'll likely start making some of the swaps for you in a week, so be sure to let me know as soon as you can if you'd rather not make the switch.