Major Science Fiction Anthologies - A Brief History
by Blue Tyson
Plenty has been written about the decline of the short story, anthology and collection, and when you read some older books they have been saying the same thing for decades, even in the first issue of Asimov's magazine in 1977.
I have also seen Gardner Dozois write about the acceleration of the 'lack of memory' of past science fiction work. Not too surprising perhaps with the pace of change.