I do not see them removing anything from their current recommendations as they probably got a lot of money to list them in there in the first place. It's all about the money, I think.
Do you have any evidence they're getting paid by all that open-source wallets? I'm pretty confident they don't. As far as I remember, bitcoin.org is living off donations.
Wasabi Wallet has not quite become more unknown despite its popularity tanking over the last couple months. So in any case I find it highly unlikely that coinjoining will suddenly fail on Wasabi for whatever reason.
In this forum we've prosecuted it, and to the best of my knowledge, I see an increasing number of people becoming frustrated with the recent blacklisting update. What data do we possess regarding coinjoin volume?