They might reference 'evil' Stewie as a brick joke down the road, but I think Stewie will still be the same character he's been since the show's return.
I'm kinda nervous about this episode, as most of the recent "Brian and Stewie" focused plots/sub-plots haven't been that good (a possible sign that the "Award Bait" episode from last year was the "jump the shark" moment for Brian and Stewie stories?).
PLOT HOLE: If Bertram erases Stewie from existence, won't that mean he would be born as originally intended to in Emission Impossible (Remember, the reason Bertram was never born in that episode was because Stewie was already a handful) ? That means we'd have a gay Bertram on the show :shrug:...Then again, the universe wouldn't exist in the first place either.
Of course, by erasing one of Stewie's ancestors (unless it's on Lois's side), Bertram is also erasing himself (as he's Stewie's half-brother on Peter's side).
In other words: Betram is basically creating a time paradox here.
No, if one of Stewie's ancestors was killed, then I'm sure either Peter or Lois wouldn't exist to give birth to Stewie or Bertram.
In fact, didn't Bertram take into account that if he kills Stewie's ancestor, he might die too since he was born from Peter's sperm? (Unless da vinci is Lois's ancestor.)
Yeah I was gonna say that too, either way, he still dies, since he kills Peter in the process and the entire universe, which means Peter never donates sperm. Bertram never gets born.