I wouldn’t call Bloom an A-lister. He’s luck to get a B minus. He lucked into the LOTR franchise, and PotC was type-casting and carried by Depp and the villians, not Bloom. Harrelson also was never an A-lister.
Nicholas Cage had A-list dreams, and tried hard to make it, but IMO never really pulled it off. Cruise doesn’t pick good vehicles for himself; if I had to guess, I would say the money to get Cruise assures an over-produced mess with too many overseers. Crowe, I think, let the fame get to his head. Gibson is just a mockery of himself. That said, it’s hard to remain an A-list, box office draw for 3+ decades. As for Hanks, he’s in his mid-50s and richer than God. I wouldn’t be surprised if he just doesn’t want to work as hard as he did before.