I would guess they got tired of being roasted. I have a feeling it was this thread + Reddit + YouTube comments that may have served as an impetus for it.
One way I think they could salvage this situation and improve on it is to simply acknowledge and embrace the issues. For one, with a number of their reps being 70-something, age-related issues shouldn't be ignored, they should be embraced. Of course, there has to be a willingness by the contributors to recognize their role and relevance might now be different than it was 20yrs ago. Rather than advice being given on what seems to be a somewhat one-size-fits-all basis that's 20yrs behind the curve, maybe they should be more nuanced. For example, combined videos with some of their older contributors as well as some younger ones. If recommending a TTP, piece of gear, etc, instead of making blanket recommendations, offering a range depending on age, physical restraints, capabilities, etc. If I'm 75, have a few ailments that limit my carry ability and performance potential, what are my options? If I'm 25, just getting started, and I need something aspirational to push myself, what are those options as well? This isn't rocket surgery.
I can roast with the best of them but, trying to be constructive here. WC clearly has the capability and most of the components to do this well. Video production quality is high. They make some great products. They've also had younger guests, some of which are highly accomplished competitive shooters. All the nuts and bolts are there, in my opinion. They simply need to combine them in a more effective and nuanced way while increasing the variety of their contributors. Just my opinion.
It looks like they simply switched many of those videos to "unlisted" status. If you have the links, they still seem to be there.