In today's technological society, is writing being seen as less important than ever?
No. If anything, a well-written sentence may be the balm we seek to combat poor communication via texting and poorly-constructed emails.
Is music truly the universal language?
In my opinion, no. In some cultures, the term "music" doesn't even exist. But it's not because they don't have any, but because "music" is so entrenched in their daily lives that having a term for it is superfluous. The building blocks for music in various cultures can be surprisingly different. If all music was based on the Western Tradition," then yes, music would be universal.
Should a person's verbal eloquence be couched in nineteenth century rules of grammar, or should it ebb and flow based on region and occupation?
As in music, in order to break the rules, one must learn them first. Unfortunately, most rules of grammar, if not all, have been derived many generations ago. One's intelligence should not be based on verbal eloquence but should be measured on how it serves him or her depending upon region or place of residence.