What Would Happen If Bitcoin ?Disappeared Tomorrow
Your bitcoin can disappear tomorrow but Bitcoin blockchain will be there and its blockchain data will be stored very decentralized by many Bitcoin users from full nodes to prune nodes.
Say as you think, Bitcoin is no longer there, of course you will buy in 2008 when Bitcoin has not been created, what people did to the economy at that time, of course that should have happened.
But all that can happen if the internet is lost in this world, while the internet is active and can be accessed I think Bitcoin remains, but when that happens, no one knows.
OP should not think of negative things about Bitcoin, take advantage of the presence of Bitcoin in the current market, I'm sure your dulan leaves the world rather than Bitcoin, maybe you are no longer in this world Bitcoin is still there, it has been felt by Bitcoin users before and at this time.
OP is either curious or fearful about a future in which Bitcoin no longer exists but he forgets that Bitcoin blockchain is decentralized with many Bitcoin users globally who download a Bitcoin wallet software, install it, do Initial Block Download IBD and have many blockchain data on their devices. It's how a Bitcoin network works very decentralized from operations to storages.
Bitcoin won't disappear entirely on Earth because strength of decentralization it has.