If bitcoin disappear, maybe can make chaos in the world....
Maybe it might cause some panic in the bitcoin community, but not chaos and especially not in the whole world.
I doubt that BTC will ever disappear. The community is here for the long term, despite the value of BTC, which is relative.
Yep, the community is learning how to trade/buy&sell bitcoin so they can keep track of their capital.
But a big scam or smth can still happen in btc community. Which may lose the trust of other users causing them to dump their coins and eventually leaving bitcoin with no value.