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.
In my opinion, this will not happen, bitcoin is a favorite in this market, until the priorities change, there will always be the king of bitcoin. There are many interesting and advanced coins, but a worthy replacement is not expected.