I like Beltranos optimism - but:
2 Billion is absolutely unrealistic.
It definitely won’t happen, you can bet money on that.
This is even a maybe for Spider-Man & the new Avengers movies coming this year..
On the other hand, becoming the highest grossing musical biopic (bohemian rhapsody - 910 Million) or the highest grossing biopic in general (Oppenheimer - 975 Million) is very much in play. As such, becoming a billion dollar movie, is also a not too unrealistic possibility.
But therefore everything needs to click: marketing, critics, word of mouth AND especially - fans showing up, drumming up & hyping up the movie BEFORE it’s release AND when the movie is in cinemas.