But 2018 will probably not be a year like 2017 when the price was going up all the time.
Do not say that because someone has made a certain promise, if bitcoin does not reach the $500,000 in 3 years, it will do something xxx, you can say that it is crazy, but a lot of people made predictions that next year the price bitcoin will reach $40,000.
Bitcoin would go the farther way people can even imagine now. Just imagine a world of crypto economy and no banks 
unfortunately banks will always exist... the government can regulate bitcoin, but will not let the banks disappear
we will see on December 18 as will be the prices of bitcoin and the following weeks.