I think TFA has warped our perspectives a bit. Let’s not forget that TFA was the first modern blockbuster to break the OW crown and claim top domestic performer and did so convincingly.
We’ve seen the OW record fall countless times and most didn’t come close to being #1 all-time.
I know a counter argument to that would be since Endgame broke the record by such a large margin it’s road to #1 is easier. It’s true, it beat the previous OW by 38%.
Only other recent example that comes close is Spider-Man which beat Harry Potter by 28%. A still collosal opening for its time much like Endgame.
Spider-Man fell about 200m short of the all-time spot despite having a terrific run. In fact, if Endgame ends around 850m it will be around 90% of TFA’s total, much better than the 67% Spider-Man had against Titanic.
Maybe not a true apples to apples comparison, but what was true back then still applies today; what goes up must come down.