now a lot of investors are investing in bitcoin, therefore bitcoin has increased very rapidly, if bitcoin decreased what should be done?, whether the investors will lose? 
I think this topic belongs on bitcoin discussion though if bitcoin keeps on depreciating in the market you don't have to do anything than to just wait until it recovers then if you are not confident anymore with bitcoins then you can always trade it for altcoins since these are also very good investments with much more potential for growth.