They could put out 1-3hr DLC's that cost real cheap like 100-400 points depending on the length. Anyone who knows the WH40k universe could think of a lot of different scenarios with different enemies.
Tau, Chaos, Eldar, Dark Eldar, Necron, Tyranids, or just rebels ect ect.
Could attack other ships or a massive craftworld, that would be like massive scenario! All types of planets, hulks, tyranid bioships... just endless stuff!
So yeah, I could almost weep that this will be such a massive missed opportunity. Oh well, just another example of devs not knowing wtf they got.