Forums are simply not as popular as they used to be and what's going on bitcointalk (lack of interest and new members) is going on every other forum that I have been part of. And even if mixers stayed, they wouldn't stop the decline, maybe only slowed it down.

Another thing to keep in mind is that vast majority of new people that get into crypto are mainly interested in altcoins since they think its too late to buy bitcoin. Problem is that if you are altcoiner, there's really no reason to come here and I think that this is a missed opportunity to turn some of those altcoiners into bitcoiners.