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 personal opinion, i believe altcoin would never overtake or reach bitcoin because it is the first cryptocurrency that was created and it has more value than any altcoin. But i think the altcoin that could reach bitcoin is ethereum because many investors would like to hold ethereum nowadays.