Implying that the only musicians that tour are the ones on the Billboard 100 is a little disingenuous. There are countless "traditional instrument" bands from genres like indie/folk all the way to blackened death metal that are constantly releasing music and touring.
Also, love it or hate it, modern country music is extremely popular in parts of the US, and that's (mostly) traditional instruments as well.
Yeah i was being flippant. That said, it really is eye opening looking at hit lists. Also, i have deep respect for country, but even that genre is heavily influenced by trap and dance music these days. Wild.