This is what would have happened in season 3
According to Ryan Murphy.
Brooke's Hit, Harrison Chooses
The third season would have picked up in the fall of the Kennedy High gang's senior year. A bandaged Brooke has been in a coma for four months, and awakens to find that every bone in her face was broken when Nicole's car slammed into her. The bandages are removed, and she looks exactly the same ... except that she's now a brunette. Nicole is put on trial for attempted manslaughter, and she argues that she was driving drunk because only alcohol could erase the pain of being sexually molested by Brooke's father. Nicole begs Brooke to tell the judge that she stepped in front of the car, which Brooke does. Turns out Harrison had chosen her over Sam at the prom, but when Sam started crying at their table, Brooke couldn't take it and fled. Nicole clears the dad's name, but her kindness is short-lived. She vows to rule the school. Sam and Brooke vow to do anything to stop her.
Harrison's a Player, Lily Kicks Josh Out
Brooke and Harrison start dating and for the first time in his life, he's popular. In a Beverly Hills, 90210 - styl-e spoof, he starts hooking up with tons of girls and breaks Brooke's heart. (Murphy says he and Pope were into making Sam a lesbian and a raging drunk.) Harrison is schooled in the pitfalls of popularity when Josh moves in with him and his mom. Josh and Lily had been doing fine, until she discovered his gambling addiction to ... cockfighting.
Mary Cherry's a Dog, B. Ho Killed by Girl Gang
Meanwhile, Mary Cherry is supposed to be sent to live in twin sister B. Ho's old 'hood, but accidentally ends up at a dog pound where she's put up for adoption. B. Ho joins forces with Nicole (and a new character, an African-American student named Unique Jones), and they do drive-by shootings, until B. Ho is gunned down by an all-girl gang. A grieving Cherry Cherry arrives at the pound just in time to save Mary Cherry from etherisation ... and to take her to B. Ho's funeral, which spoofs the whole "South Central, shot-too-soon, homey thing." After Cherry Cherry pours out some Malt 45 liquor into B. Ho's coffin, she once again accepts Mary Cherry as her daughter. Mary Cherry joins Brooke and Sam's group. Cherry Cherry starts teaching a daily course at the school called "Madonna 101." (Murphy says they were trying to get Madonna to make a guest appearance.) And Unique turns so psycho that she even scares Nicole.
Brooke and Nicole Unite, Mary Cherry Buys Melrose Place
Nicole goes to Sam and Brooke and begs them to help her stop Unique from ruining the school. Brooke and Nicole reunite as best friends, and all is well until Kennedy High is bought and converted into a nursing home. The kids are forced to take their GREs because the old folks won't wait for the real estate, and they all go off to college early. The screen goes black and -- poof! -- it's five years later. Mary Cherry has bought Melrose Place and they all live there rent-free. The last three months of the season is spent spoofing the twentysomethings-on-their-own genre.