I think it is just like pretty much any other "consumer-focused" industry or business these days.
It's about consolidating resources, shifting resources, focus, to "key industries," maximizing profits, minimizing costs.
Those "new fragrances" on the level you are talking about, inasmuch as they are happening at all, will be being developed by dedicated but "unknown" artists, making small batches in their basements, driven more by passion than by money.
Whether any one of us ever owns one of those fragrances will depend largely on a combination of happenstance and our individual willingness and wherewithal to take a chance on trying out the work of some unknown, individual fragrance artist!
Most of us will never hear about them. Even if we do, some of us may be more likely to spend our limited resources on something we know, others may be more fortunate in terms of resources, but be more inclined to do our adventuring and experimenting with names we know - in short, it's just about marketing, and a changing world!