Sorry nope, Hair metal / glam rock was on it`s way out as much as 2 years before Nirvana came along.
Between 1989 & 1991 the focus moved away from hair metal and on to banRAB like The Chili Peppers , Faith No More , REM , Janes Addiction and all that lot.
Grunge didn`t kill hair metal it died from over exposure, Grunge mearly kicked the corpse while it was down. You don`t see people claiming emo killed grunge in the past few years , because it didn`t.