Great topic, great posts. Let me introduce myself: 41, I'm a musician when not working, ambient lover, organizing small Ambient festivals here in Belgium and "active" in the ambient/experimental scene since 2007/2008. Familiar with the known ambient artists I've seen in this thread: Roach, Rich, Vidna, Oophoi etc. For me, it's difficult to say how the ambient scene "overall" is doing compared to the past because I'm not sure I'm 100% up to date with the latest ambient releases and developments. It's underground, difficult to discover, took me 2 years to find out about Hypnos ;-)
What I recommend every musician is to cooperate with other musicians, organize your own gigs and promote the ambient scene that way. Imo, there's nothing above a good ambient gig, that's where you experience the real thing, the deep and the beauty of this style. Take the initiative and you will be rewarded.