Why does most new music suck?

I'd like to add something that may illuminate some of your feelings.

Recently when I hear cheesy disco music (not at all my genre) I often think to myself, "wow these are pretty darn good musicians, and they did it all without Protools, samples, or autotune."

My point is that even the most disposable of music from the 70's had a level of musicianship you seldom find in today's cut an paste world of production.

In fact much of today's pop music is mean to be disposable.

The corporatization of music and film has often led to chasing the lowest common denominator.

An anecdote from the the BBC documentary, "Yhe Monster that Ate Hollywood." may also shed some light on these similar industries.

Up until the 80's or so, the way a film got "greenlit" was a 3 or 4 executives in a room discussing whether or not they though the script under consideration would make a good film, based in their gut story instincts. Now, often the man consideration of whether a film gets made or not is a series of corporate decisions like whether or not there the project has a tie in to a fast food chain promotion, or a car company, and how it play to the global audience.

The golden age of cinema and music has passed us by. Thats not to say there isn't great work being produced by certain artists, thay may in fact eclipse works from the past, but it is minority rather than the norm.

Another factor is the influences of today's artists. The Stones, Dylan, etc were real students of authentic music like early blues which were steeped in a rich history and tradition.

Often today's artists will cite influences on the order of Van Halen or Nirvanna, or maybe Led Zep if your lucky,

Just my thoughts on the subject.

I was listening to some modern hip hop with some much younger friends (I look about 15 years younger than I am) and put on Talking Heads crosseyed and painless.  The 21 year old girl started grooving to it immediately.   I explained it was made in an era before protools and auotune.   
Even though not my genre, old disco has a much higher level of Musicianship than much of dance music today, which is designed to be disposable.   
There are however bright spots in artists  like Regina spektor, who was Classically trained in Russia, and her pop music shows the complexity of those musical influences.  
Similarly, someone growing up in a diet of Macdonalds would never develop the palette for gourmet (or even whole) food, I believe that's what's fueling the disposable and simplistic music of today.   
I was surprised to find several years ago that my teenage nephew liked Frank Zappa, so there is some hope I suppose.