Stravinsky died in 1971, Shotakovich in 1975, Britten 1976, Khachaturian 1978, Barber 1981, Orff 1982, Bernstein & Copland 1990, Messiaen 1992. There's a rough but noticeable "trailing off" of greatness there - I'd argue they all just about deserve the adjective but even most of those names struggle to measure up to the big names from centuries past.
Some might argue that there have been greater than those names since then, or may be some (at least potentially) great composers still living. But do you think the world will ever see talent on the scale of a Wagner, Mozart, Beethoven or Tchaikovsky again? If not, why not? Is it just because times have changed and that people with such natural abilities will find an outlet for their talents in other genres or other arts?
I'm sure the regulars will happily tell me if this has been discussed before - if so, profuse apologies - but I just started wondering and found it easier to formulate as a question than to search thousands of threads.