I thought your point was that just because you own the kit to listen to music, it doesn't follow that you necessarily do?
Correct
So the technology moves on, the choice increases, and people can move from free services to paid ones if they have the interest. The proliferation of paid services (including high bitrate 'hifi' services or tiers) surely goes to show that the interest in music remains?
How do you figure that with no ratio known of one to the other? It could be 0.001% or anything else. Suitable kit has proliferated - probably similar to the ratio of guns to US population - quite a bit more than one item per person. What is the number of individual subscribers to all these services?