Xiao Qiao True Beauty
Captain Talavar
1) Stewie still has a time machine. Let's not forget that before he destroyed it, he traveled into the future to get the latest Christmas presents. All present-Stewie has to do is intercept past-Stewie at the toy store, kill him, and use the return pad to travel back to the past, and then he can make sure Brian isn't killed.
2) A future episode of the season is called "Brian's a Bad Father" and there's another future episode called "Brian the Closer". So yeah. I don't think Brian's death is going to last.
Just because he has episodes named after him doesn't mean he's coming back. Plus a month passed since he died so that time machine bs is null and void. Stewie is probably the smartest one in the family, if he couldn't build a time machine in a month then its over.
It has nothing to do with building a time machine. Yes, a month passed, but that likely doesn't mean he's passed the date in the future to which he traveled. I'll concede that the episode names don't necessarily mean he's coming back, but I've explained already in plenty of detail how Stewie still has access to a time machine if he remembers his trip to the future.