That's the problem. There is still rock out there. There is rock out there made by females. Just because Rollingstone isn't reporting on it, it doesn't make it "dead".
Shirley Manson - she's rock.
Sleater-Kinney - they rock.
Oh and PJ Harvey totally rocks.
Liz Phair. Lisa Loeb. Karen O of the Yeah Yeah Yeahs. Gwen Stefani. Brody Armstrong. ..

The 1980s had rock. There was Tom Petty, U2, The Replacements, Guns N Roses, Van Halen, The Cure, and I'm not gonna go on..
The above may not be rock in its "purest" form, and you may think some or all of those suck, but they're still rock.