Why is the world so sure that Bitcoin and blockchain is foolproof. What if there's a critical flaw that everyone has overlooked or not noticed and the whole system crashes down? Is it really impossible? Is Bitcoin a perfect machine or system?
What if tomorrow a virus breaks out and kills all of humanity before we can discover a vaccine or a cure?
Anything is possible, is what I mean to say. But is it probable? No.
Same goes for Bitcoin. At this point, the probability of somebody finding a critical flaw in Bitcoin is almost non-existent. So there is no point in worrying about it.