WotC's business plan has never changed. They announced this ten years ago and they're sticking to it. We get 3-5 offerings a year, mostly adventures, with the occasional setting or crunch book from time to time. The crunch books are VERY well signposted with numerous Unearthed Arcana offerings and polls to make sure that every single WotC book that comes out is a fantastic seller. They've made an entire business around not rocking the boat and being as broadly appealing as possible.
It's a fantastically successful model. I'm still not sure what evidence people have put forward that they shouldn't keep doing exactly what they've been doing. I mean, good grief, this year was the first layoffs at WOtC in ten years. I remember the YEARLY layoffs during the 3e days. Every single year, a large chunk of the staff got their pink slips for Christmas. All because of the boom/bust cycle of D&D.
This is what a mature business looks like. Stable, safe, and predictable.