Agreed with Dale about tending to each faction at least once a year--whether that's new models, updated stats, etc. For an entire game system that contains multiple factions (DW and Firestorm Armada, for example), I think something needs to come out at least once per quarter--which, with those two games, one release per faction per year would satisfy that requirement if they didn't drop it all at once.
I don't have many complaints about Spartan Games, but one thing I think they could do to help themselves is reduce the number of simultaneous new releases. We've discussed ad nauseum their release schedule and how they tend to hop from system to system; I wouldn't mind seeing a steady trickle all year of 1-2 releases per month, instead of them dropping a whole bunch of new models at once and then not touching that game for 10-12 months.
On the other hand, they may just be trying to be fair to all the players: i.e., new battleships are developed for the Core 7 factions, and they release all at once (or very nearly all at once) so that all the core faction players can run new battleships at roughly the same time. Otherwise, you might get the FSA battleship in January and the Russian battleship in July, with one per month in between. Great if you're the FSA player, but half a year goes by if you're the Russian player before you get your new ship!