I think we're starting to edge into a new era where Fans, especially younger fans, are looking for new, younger, characters to find attachments to; definitely compared to when Vol's 2 & 3 launched.
It's just a case of hitting on that rare Ms Marvel or Snowguard as opposed to say Flex or Radius.
I'll always want the mostly Byrne characters, but I shouldn't be comics' primary audience anymore.