It's almost 8 months of 2018 and we have not seen any reasonable hikes for the altcoins,
It was only Ethereum that hit a good value of almost 1.4k$ in the beginning of the year . Since then it's pretty dull.
Forget overtaking can any ALTCOIN ever reach a value near Bitcoin.
I dont think that there will be an altcoin that can overtake or can beat the value of bitcoin. Altcoins prices always depends on bitcoin when it comes to prices hikes and downs and it happens all the time. Just like what happened to the market now. Everytime the price of bitcoin goes down then altcoins prices follows aswell.