I agree, the Sims Youtubers haven't been releasing much content lately.
I think some of them are just waiting for the new gamepack to come out to release more content.
I honestly haven' been watching as much Sims content on Youtube. A lot of it is too repetitive and boring. I don't know if that's because of the actual game, or if the Youtubers just aren't as interesting as they used to be. Maybe I'm just too old for all of it.
The only people I enjoy watching consistently are GreyStillPlays, CallMeKevin and Juno Birch, but they don't post very often. All three are hilarious.