Everything that follows contains huge spoilers for Avengers:Endgame, so don’t continue reading this post before seeing the movie!
The Ancient One told Bruce that the Infinity Stones create the flow of time. But Thanos destroyed all six. This leads me to two theories:
- Scott could only escape the Quantum Realm (a one in a billion chance) because the Stones were destroyed, so spacetime is already starting to get wonky.
- With the Stones gone, the flow of time will deteriorate and the MCU universe will be destabilized. This effect will possibly be explored in GotG3 since it is currently the only Cosmic franchise in the MCU, and will be the setup for Eternals. If spacetime has been fucked up, they will be the only ones who can fix it.