Nothing changes in 2018. Surely bitcoin will remain the king of the crypto market. Even in the next 2-3 years, this can not be changed 
Yes no doubt bitcoin still dominated the King of all cryptocurrencies and still win for being crypto King this year 2018. It is really hard to some altcoins to bit bitcoins as the King because the popularity and the demands were still in bitcoins due to its legacy build strong in cryptocurrency market.