If satoshi nakamoto suddenly decides to become devil and crashes down the server and take away all the money?
Then what will be the value of the bits??? again $1.
I understand your apprehension. Now, what will happen if there can be a sudden crash in the value of Bitcoin? You mean a big dip can happen...well I would say that many people would be so happy if there can be a big crash because by then many can buy Bitcoin at a cheaper rate and when people are buying in dip its value would start to rise again...this is just a cycle it happened with Bitcoin before and nothing is stopping it from happening again. Now, every time that Bitcoin could fall, it can easily gather itself and get back on its feet again as if things just returned to normal. Now, as to your proposition that Satoshi can suddenly be possessed by the devil and would do something that can harm Bitcoin, the answer is that Satoshi has no power to do that...that is why we have the blockchain technology where no single person can decide anything that can affect the whole network and it is Satoshi himself who designed things that way...this is just one of the many meaning and application of the word decentralization.
So, just relax and buy your own Bitcoin now knowing that we have a god future here...the whole cryptocurrency has a good future though you have to be careful with entering just any type of ICO and 'shitcoins' as these can be used by many scamming artists to be victimizing others for their money (this is a general statement and not specific meaning not all ICOs are bad and not all are good).
Good luck.