I would imagine any company has to ask a few questions to build a product like this.
1. Is there going to me any material for more than 11 channels? Although, HDMI 2 can have more audio channels whether they are going to be used in material has yet to be seen.
2. How much of a market is there for more than 11 channels? You can have more channels for bi-amping, multiple surrounds or re-mapping like Trinnov is there going to be a big desire for these products.
3. If there is enough desire can it be developed the unit so it can be prices competitively?
4. Will there be enough sales of these to be profitable?
Whether it is Anthem or any other company they have to factor these basic questions. There is a reason these specialty processors cost so much. If Datasat or other specialty company had hundreds of thousands of units like Onkyo receivers than the cost could be much less. In the lower price range of products the majority of consumers will only do 5.1, fewer do 7.1 and even fewer will do Atmos/ DTS-X. In fact receiver sales are down as more consumers are using sound bars instead of surround sound
As an enthusiast, I want it all! But, I understand a company waiting to see what products are going to be in demand before manufacturing new products that might not sell. I doubt D2s have been flying off the shelf.