For as phenomenal is the game is, we sure are getting some lame cop-outs in place of tying up loose ends.
Edit: looks like the spoiler tags render correctly on the web page, but not all apps support it.
tl;dr
It was magic and just disappeared and people are used to magic so… yeah shit’s gone, yo
From my understanding Calamity Ganon was just some of the gloom/malice which would allow him to gain a somewhat physical form to manifest his rage, but without much of his mind behind it as he was still being held asleep.
SPOILER AHEAD
All of the Ganon blights actually look exactly like the gloom construct that we end up fighting with mineru, a bunch of tech all glued together and controlled by gloom/malice.
As to why it only happened every 10000 years (if it even happened more than twice?) I’ve got no idea.
If I had to hazard a guess, the “ten thousand years” aren’t exactly 10k years in the literal sense, but instead just mean “a very very long time ago”.
I mean, if someone today says stuff like “there is a myriad of stars in the night sky” then they also do not mean that there are exactly 10k stars (because that’s the literal translation of “myriad”) but instead mean that there are too many stars to count. Maybe the same applies to BotW?
EDIT: I just checked wikipedia out of curiosity and it seems that “ten thousand” really does mean “numberless or infinite” in Japanese. I wouldn’t be surprised if Treehouse of America accidentally went with the literal translation when a metaphorical one (like saying “an eternity ago” or something similar) would have made more sense for Westeners.
That makes a lot of sense, just like with the secret stones, which would have probably been better translated as sacred stones, as they are not secret.
…and it sounds way cooler IMHO. “Secret Stone” sounds like something a preteen would use in a short story about a superhero they just made up, or maybe a placeholder name that they never bothered to change.
I’m just going to pretend that they ARE called Sacred Stones and Hyruleans just pronounce it a bit differently.