You can only do so much with metal, and the music is following the same path as the worldly element did. when the first metal was smelted it revolutionized the world, the brass and bronze ages brought new tools and ideas to the world, and brought us out of the stone age. so, so far, the stone age gave way to the metal ages, and the rock age gave way to the metal age, pretty paralell so far.
throughout the ages metal became common, and was taken for granted, until new tools were created to make the metal do things that people had never thought possible, the 1800's started the industrial revolution, machines were created, new ideas formed and productivity skyrocketed, it was slow going for the first few years, but once the methods were worked out, it became insanely efficient.
in the mid to late 1980's industrial music was formed, like the industrial revolution, the tools initially were crude, and everything was trial and error, still based on metal, but going in radical new directions.
before too long new tools were created in the music industry which limited the need for metal as a resource, (synthesizers, drum machines, etc.) just like in the world of industry, the dependence upon metal is shrinking, and we are using more synthetic materials. just look how much plastic is in your car compared to a car made in the 70's
so in conclusion, here's my findings to prove a direct connection between the world of music and the world of industry, and by looking at the examples set by the world of industry, we all should have seen this coming.
1400-1970 = stone age (millenniums of life, nothing new)
1970-1989 = metal age (relatively short revolution, new ideas, limited use)
1985-2002= industrial age (mass production of new ideas, in a very short time)
2002 and beyond (human less production, perfect, uniform product)
sadly the industrial age is giving way to the automated age, which also is happening in music, modern factories are run with bare bones staff and programed robots, the same with music, powerful music production programs are rapidly removing any thought or creativity that was once the driving force behind music, but following with industry, music production is now a streamlined, precision, operation, with minimal human error. A computer can generate a sound upon command that would have taken hours for a human to locate, program or sample. And process complex equations in milliseconds to make for a perfect song/product