I haven't read the interview. But I wanted to comment on the "no Sela in Nemesis" idea.
In-universe, I can believe never seeing Sela again.
She got bested in her involvement in the Klingon Civil War. Not so good for her.
Then she was again thwarted in the Vulcan Invasion operation. Two big failures on her record.
After those two botched operations, I can see Sela getting "disappeared" by the Tal Shiar. Or at least removed from front-line command and placed in a position never to be seen again.