Too true. Look at what's become of television, sculpture, dance, popular music, auto design, and many other art forms. In my over-half-century of watching the evolution of these art forms, they've undergone marked and noticeable decline and degradation.
Even creative areas such as advertising, clothing design, broadcasting, appliance design, and the design of public buildings and spaces have seen departures from traditional axioms of artistic composition, which has resulted in a pervasive weirdness factor that's hard to describe.
That's not to say that some excellent art doesn't still manage to bloom here and there, but per my observations, there's an overall downward creep to most of it, which I feel is the direct result of the corrosive influence of hard core leftism.
For instance -- although I've had an intense love of music my whole life, it's gotten to the point where there's little new music that appeals to me. I realize that some of that is due to my age and tastes, but a lot of it is due to the fact that real artistry has been, for the most part, banished from the popular music industry. One exception is Country music, which is still resistant to influence from the left. Consequently, I now prefer that genre over any other.
Just incidentally, recent discovery on my part, here's a fine group that's doing something new and amazing in the jazz genre:
Although I also have listened to a lot more country in my adult years. (And bluegrass and other folks musics to the extent non-communist contaminated.) In part because, although I don't get out so much anymore, my favorite adult beverage serving establishment of many years is a roots music venue:
http://www.danssilverleaf.com/
Ever been there? Here's some country from Dan's:
http://www.youtube.com/watch?v=ieDL4fFDIUI
And some rock and roll: