[beat]

That's already happening, deliberately, in the music production stage. Arguably the most popular speaker in the world for professional music mixing is the Yamaha NS-10 (you may have seen pictures of them in recording studios, with their distinctive white woofer cones). They are terrible in terms of frequency response! They are aggressive to the point of nasty right in the 2khz range, where a: our ears are most sensitive (ears do not have a linear frequency response!), and b: human vocals are most present.

For vocals and vocal-like instruments such as saxophones and lead electric guitar, the NS-10 is downright evil. And that's why it's popular. If you can make a mix sound good on the NS-10, it'll sound good on almost anything else.