Personally, I think focusing on the novel format is a mistake. Its clear there's some sort of trouble there, even if we don't know what it is.
My solution would be to overhaul battlecorps to be friendlier and not require you to purchase the whole back-catalog at full price. Too many of the stories in there are tangental sidestories that don't advance the core plot, and while I MIGHT enjoy them, I would have to buy sight-unseen, and I simply don't have the budget for it. (I'd also revamp the user/pass retrieval system because I cannot for the life of me recall what my precice username was, nor the password, nor what email I had associated with it. none of my guesses have worked). I'd change the Battlecorps back-catalog one of two ways. Either make it netflix-like where so long as you're subscribed, you can read everything (an idea which does have some rough edges, yes), OR make your subscripton length radiate out both forward and back for as long as you're subscribed. Sub for a month? You get everything from the date you signed up back 30 days as well as ahead 30 days. This would discourage people from just buying in, archive binging, and popping out. Perhaps incentivize it further by offering some manner of exclusive to the subscribers.
Hardly the only solution to the issue, but we need core fiction. Short stories inserted into sourcebooks and experimental sourcebook formats just don't bring the universe to life for me the way the novels did. When characters and factions fall in the span of a summary paragraph, it takes on a very cold and detatched sort of feel. The death of Clan Nova Cat felt almost completely different than the fall of Clan Smoke Jaguar. and it needs to be Core fiction too. Look, for example, at the initial dark age fiction. Isolated incidents involving isolated individuals. When was the last time we heard what became of Raul Ortega, or Mason Dunne? (Heck, for a long time, I'd started to wonder if Caleb's friend wasn't imaginary, just very stealthy.) It wasn't until later in the novels, when we had a core cast stand out from the crowd, and I had characters to root for, that I started to care about the DA material. Its not that I mind less epic stories, I just think that a dinner that's all mashed potatoes, and no steak, is a pretty boring meal.
Its kinda heartbreaking that we're on the verge of having an IlClan, but the epic battles, the taking of terra, it won't even happen on screen. We'll just get an essay on it in sourcebook form.