It could be argued that more and more people don't bother because they know they can watch any performance they wanted to see on YT the next day, but that is quite a massive drop. I thought I saw something about how ratings for all awards shows have been way down recently (if I am remembering correctly), so this may not be a problem exclusive to the Grammy's. But hey, the people who run that clown show have narrowed their target audience by only focusing on a few genres, so this is what happens. Even though rock music isn't the force it used to be as a mainstream genre, by ignoring it completely, you make a lot of rock fans, and there are still millions of us, not give a crap about tuning it at all. I think I have paid attention to the Grammy's maybe two or three times now in the last 30 years (once for Arcade Fire, last week for Taylor Swift, and there might have been another I cannot recall).