I honestly think Cavil loves it enough to make the best possible version of what media giant approaching 40k as a series for the mainstream would be.
It is just about how good that is, and if that then captures enough non-40k fans for Amazon to justify the series as an 'Iron Man' moment. I think it has a chance because of how grim the younger public's perception of the future is and how very similar it is to the past where we were much more into the horror and Godzilla vibes at the movies. Where seeing something as dark and grim as 40k will scratch an itch we didn't think of until now.