I think AOS has outsold WFB by a margin, so no worries. We've had an amazing 12 months of x3 new armies, Broken Realms and a new Ed. 40k has suffered with mostly books since 9th Ed was launched and I think they are brining stuff forward due to the app issue, but getting new kits into their biggest line is no bad thing.
When the app gets out, and we get new books, I'm sure some kind of roadmap that we've seen for every game other than AOS would go down a treat. They need to invest more in a dev team for sure, but at this point in the project that is probably a bad idea.
I'll be buying the Old World on day one, and still keep my 10k+ points of AOS.