You might find this article in the NYT of interest. This claim caught my eye:
"The only growth in the market has been for grand pianos, of which almost 50,000 were sold last year (including pianos with automatic players), compared with only about 20,000 in 1983."
Why? The article says nothing more about it. But I think it's a point well-worth thinking about. And I'm not sure the answers are necessarily good ones, musically speaking, as concerns the future of the piano.
I sometimes wonder if Robert Palmieri isn't too far from the mark ""We've seen that, as time rolled on, the clavichord faded away, and then the harpsichord. Perhaps in the future, we will attend piano concerts in the same way we attend harpsichord concerts today." Link