Changing the role of a female (or male for that matter) character as societal attitudes evolve is a different matter. I'm all for comic book characters existing in today's world with todays attitudes A sliding scale time line is best for this type of serial fiction. Spider-man is always happening right now. His origin always happens in the past. (how far in the past is irrelevent) You don't have to write Sue a 1960s woman anymore than you have to dress her in 1960s fashions. But she does have to be Reed's fiancee and Johnny's sister.