Everything is becoming blander and more homogenized with globalization. Look at cars. When I look back on footage of the 60's to the 80's, cars had so much more charm and character. Many of them were intensely cool looking. And when I saw footage from the US growing up in the UK, I always loved how the cars were so much different to the cars in Europe. They had America written all over them. Sometime in the late 80's/early 90's, cars began taking on this kind of bland, nondescript look. Soap bar shapes replaced the more angular lines of yesteryear, and the generic SUV look took off. Now all traffic looks the same to me. And you probably wouldn't see much different on the roads of New York as you would in London or Paris.
The fact is that most people have very bland, uninteresting tastes, and the market was bound to end up here eventually. Why bother going to the effort of writing and producing interesting, artistic music when you can just snap a bunch of generic sounds together and have a generic singer do that generic American Idol style warbling over the top? Why write a melody when you can simply give the singer a nursery rhyme tune and have them embellish it with sickly ornamentation? Why write interesting musical parts and look for talented musicians to play them when 99% of people don't give a damn? Just bung in a few obvious notes in the right key, and as long it's a sound that people recognize as pop they'll sing right along.
The sad thing is that society does not value music as an intellectual art form in the same way it views things like literature. Imagine if, at the age of 40, you told someone that your all time favorite book was The Little Hungry Caterpillar. People would look at you askew and wonder why you hadn't developed a more adult taste in fiction. But apparently it's quite acceptable for someone's musical taste to freeze at the age of 10 and never develop any further. Some of the crap I hear on the radio now really is the melodic equivalent of a child's nursery rhyme, and yet I frequently meet grown adults who listen to it out of choice. If you suggest to them that perhaps it's time to develop a more mature taste in music, you get the usual "who are you to say your music is better than mine, it's all subjective."