I’ve noticed that some film theorists have been pondering how the size discrepancy between Godzilla and Kong will be handled in the upcoming film from Legendary Studios, Godzilla vs. King Kong. As the kaiju films from Legendary try to adhere to the continuity of a timeline established by earlier films, then the battle will almost certainly takes place after the events of both Legendary Godzilla films and Kong: Skull Island. While it is established in Skull Island that Kong is not fully grown, many sci-fi nerds are hand-wringing at how unlikely it would be for Kong to have grown to a sufficient size to challenge Godzilla (I guess they have some insight into the growth rate of fictional monster-monkeys that the rest of us lack).
I’m going to speculate that, barring the movie taking place far in the future, that we’ll see a more even match-up from having a smaller Godzilla. I think there’s a good chance that Godzilla will die battling Ghidorah in the upcoming film, King of the Monsters, only to have its role of heroic guardian kaiju filled by a juvenile/subadult of the same species; sort like how the end of the heisei era Godzilla vs Destroyah played out.