I HOPE there is a demand for baroque, classic and romantic music - and not only hip modern styles... and I can confirm that the soloist I often accompany is getting enough requests to sing classical music, operettes or musicals, not only at church wedding ceremonies (in Germany).
And the ensemble voices can also be used for swing. I can't imagine there are no audiences in the US which appreciate classical music during dinner for example.

BTW, the owner of that homepage works freelance for Yamaha Central Europe (she has given presentations since the 1980s for Yamaha), I just looked it up on her personal homepage.