There are seven movies and a ton of Disney+ Marvel shows coming in between the latest release Black Widow and the third Ant-Man movie.
At this point, maybe we’ll even see Kang the Conqueror in costume for the Doctor Strange sequel prior to Quantumania!
Not to mention how Kang’s familial connections could set up the Fantastic Four reboot as well.
And since Marvel decided to plant the seeds for the villain already, perhaps Jonathan Majors could have a larger role in the MCU in the next couple years leading up to it as well.