What is "industrial" music to you? As stated before, what the general public considers "industrial" is more synth-pop or ebm than industrial due to the advances in technology, the way artists are using that technology, and what audiences want to listen to (thus what record labels are releasing as industrial). In truth, real industrial music is more soundscapes as Troy mentioned (think Einstürzende Neubauten with their trademark use of custom-built instruments, predominantly made out of scrap metal and building tools, and noises, in addition to standard musical instruments). Sadly, most of this music is considered "unlistenable" by the general public.
Personally, I'm into all forms of industrial music. Being a musician who has seen firsthand the advancements in technology (and how it's affected my own songwriting), I've come to embrace the changes in the scene since the late 90s. Overall, it was many of the industrial rock bands from this period, such as Diatribe, Chemlab, 16Volt, Stabbing Westward, and Treponum Pal, that got me into the scene in the first place.
In regards to your question "Are Industrial music listeners a dying breed?", I believe the answer is "not really"... I believe that most people simply aren't exposed to enough of it. Over the past few years, I've introduced some of my co-workers (who were mostly between the ages of 18 and 25 and open minded) to a wide variety of industrial sub-genres, and have been met with surprisingly positive feedback. As I stated before, it's about what sells, and the record industry has dubbed industrial as a fad, and swept it under the rug. Those of us who's life has been impacted by these artists will continue listening to their music. I do understand that most people are a little irritated by how the genre has changed over the years, but they are still listening to the same music (just not what's modern).