The Engine Prime analysis data format and network sharing protocol end could perhaps be made open source (or its limited equivalent as far as exploitability) so other companies have the option of coming on board, and I don’t think coming out with non-dual-layer econo units with bare bones features through, say, the Numark branding would be the worst idea. Cheaper DACs, faders, and other parts that you see on the Mixtracks, etc.
That said, I understand why they’d also be motivated not to do either. The Prime series is so adaptable and able to read other formats & meta info that a lot of their strength is just the ability to be inclusive without needing to create a cross-brandings or cross-industry ecosystem. In the long run, I think requiring people be tied to a particular ecosystem is probably the wrong strategy, anyway.
I also don’t love the idea of InMusic going crazy on too many DJ gear brackets and tiers. I’d rather they focus on fewer really great products than keep throwing spaghetti at the wall as Numark has done for so long, particularly since they sometimes had the habit of discontinuing products instead of resolving all the flaws. But as far as niggles go, that’s admittedly a minor & odd one to have: the luxury of too many product lines for the consumer.