I don't think it's too early... BUT, I don't think there was anything too memorable about the 90s. There wasn't anything very distinct, except for some certain things that every joke has already been made about, and other things that could be considered distinct:
Spice Girls
Titanic
NSync
Backstreet Boys
WWF getting huge with Stone Cold and The Rock
Bill Clinton / Monica Lewinski
Columbine
The Matrix
Princess Di's death
Kosovo
Jurassic Park
Wayne's World
Mighty Morphin Power Rangers
Friends
Seinfeld
90210
Nirvana
Sega Genesis (Sonic the Hedgehog)
Super Nintendo
Nintendo 64 (Mario Kart and GoldenEye)
PlayStation
MC Hammer
Vanilla Ice
Beavis and Butt-Head
Little Mermaid, Beauty and the Beast, The Lion King, Aladdin, Pocahontas
Radiohead's "OK Computer"
Fresh Prince of Bel Air
Full House
Family Matters
Reading "Goosebumps"
I can't think of anything else that "defined" the 90s. This was pretty much it, lol. If a well-written movie could be made based on this list, I'm 100% behind it, but I don't think there's anything too brilliant that could come from it.