I'm not sure if thats true, I think its about 30 minutes on average between difficulty changes.
I coudl be wrong though
yes it is. I can see difficulty changes every new block on pool.. and it's also mentioned in first post of this thread.
So let's say hypotetically, EAC go huge and diff reach like thousands, if almost everybody stop mining that coin for a few, difficulty goes back around 0.* on the next block?
(I don't even know if something like that can be true for BTC and LTC too for example)
No, there's a limit how each block the diff can be varied, both upside and downside. It's about at double or half and not beyond it. Otherwise the coin is subject to easy attack, that people will make the diff oscillate wildly. For now if the diff is 10, say, and most people stop mining, the next will be around 5, then 2.5, then 1.3 etc, until it hits a balance (determine by the actual block time).