The failure of the Godzilla “Monsterverse” franchise, for whatever reason (most probably mass apathy for giant monsters), just again emphasizes what a miracle the success of the MCU has been. Again, Kong vs Godzilla is pretty much already done, so it will be released, I’m sure. And MAYBE two ‘stars’ in the title will allow that one to fare a bit better. Not likely, but possible. Ah, well, we got a handful of pretty decent movies out of it.
As a what if, if GKotM had been huge, would Warners have had the leverage to convince Toho to let them bring Gamera into the mix? I doubt it, as Toho is historically very protective of Godzilla. However, it’s a very fun and now wistful thing to think about.