When I saw that ending,one of my theories was that Thanos would have created another reality (like Wanda does on the comics) and on it Wanda would have the babies. By beaking the reality, she would lose them. Basically House of M except it would not be Wanda’s doing.

@anon
So what are your theories for avengers 4 and how Wanda will play out in it?

Anons, these questions are related so I’m tying them together.

Yes, I’ve had that exact thought! I think we have two points that support that:

1. I don’t believe the dusted Avengers are going to just stay gone until the movie’s end.
1. Parallel universes have been brought up in Doctor Strange, and he’s one of the dusted Avengers.
2. On the flip side, I’m pretty sure the writers have specifically said ‘no alternate universes’, but I can’t find the interview.
2. Like I said here, if they want to bring in Tommy and Billy, now is basically their one shot.

Okay,
so I’m well aware I’m viewing this through the lens of what I want to
see. My theories are coming back to her being important, but that could
easily be projection. And we know so little about it, all of our
theories are basically just us soft writing the script from whole cloth
(or scraps of cloth anyway).

BUT! If we’re going to be theorizing, I say let’s shamelessly tailor that script. What else do we have to do?

So, what could alternate universe Wanda with babies include?

• Amnesia. If they’re looking to replicate Diassambled/HoM, a Wanda who
  doesn’t remember her history is probably the closest we’ll get to a
  Wanda who is unable to differentiate realities.
• In the comics, the
  Stones don’t work outside of their home universe. Her power was
  connected to the Mind Stone. She may be now be powerless.
• Or so we
  think. One of the things the original twins were meant to represent was a
  Wanda’s powers grown to unprecedented levels. Perhaps
  her power lies with her children.
• This could still mean Wanda loses her regular powers–thus prepping her for an apprenticeship to Doctor Strange.
• If Wanda has to lose her kids, then I suspect the writers will want
  Wanda being the key to connecting the universe so that she has agency in
  this loss. Sacrificing what she loves most (again).
• Post-credits stinger of a kid who’s referred to as “Billy” in the last second.
• We just got confirmation A4 is not called Infinity Gauntlet. Could it
  be Disassembled? I’ve heard that tossed around for a long time, but with
  the end of IW it takes on a new meaning, with many of the Avengers
  being literally disassembled.