I hear plenty of Latino and South Asian music on the AM band. Old school R&B and gospel also. Sure, the AM band isn't first choice for music. But it provides a broadcast venue for formats -- including music formats -- that don't have a large enough audience to support an FM station. Smooth Jazz would be one of those formats.
I would guess 1090 stays sports, though. Whether it changes networks is anyone's guess.
You're right. I mean't what dominates AM, that is spoken word, whether it is news, talk, or sports.