While the cost and hassle of getting a visa obviously didn't have anything to do with the decreased interest in jazz, you can reasonably expect it likely to have impact on the future of musicians ability or desire to perform internationally.
The Musician Tariff
Listening to Heather Bambrick on Jazz.fm this morning I learned that the time to process a visa application for performers has doubled and that to get an expedited visa now costs $2,800, limiting the ability of musicians to schedule tours in the US.
I have such a hard time even finding a jazz club, learning that now we can’t even get musicians just makes me even sadder.