This was more of a terrible business decision by DB management. They discontinued CNL back in 2016 because they no longer believed in the product and essentialy gave up to the airlines. In the meantime, OBB invested heavily into night trains and when DB decided to exit the market (trains between AT and DE used to be operated jointly), and few years later they're making incredible money from it. From this perspective, the narrative of night trains dying and then being revived isn't entirely correct if we're looking at nightjets - OBB's night trains operated continuously all the time, while on the other hand there wasn't any revival of DB night trains, since DB still doesn't operate any (side note: Yes, DB is still legally a carrier of nightjets on German territory, because OBB doesn't have any operations there, but this is sort of an ACMI equivalent. DB provides staff with licence for Germany, and in some cases locomotives, for a fixed price, but the entire commercial risk, as well as profits, are on OBB.)

Of course the rise of new services such as European Sleeper, SJ EuroNight and similar is another matter.

I'm very excited to try the next-generation nightjet hopefully sometime in the spring (sorry, OBB, but until you launch trips to at least Barcelona, you're not seeing me in the winter).