The gyaru lifestyle hasn't died out. It's been going on since at LEAST the 70's, it's just changed hands every generation and gets a new name. The bottom line is a gyaru is a trendy girl who modifies their uniform to look cute. The overly tanned look like in the picture is a stereotype these days. Same as if you saw a picture of a 6'9" black man with a huge afro with a comb in it, holding a watermelon in one hand, a foot-long obvious dick print gliding down his pants.
Normal gyaru are harder to find, like a game of Where's Waldo, but they're around. Just gotta not look for the stereotype and look for the definition.