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'm not sure that any alternative currency will be able to bypass bitcoin by capitalization. But we see that the market is very manipulative. And in such a market anything can happen. It is possible that Ripple will do it .. But bitcoin is very much trusted by market players.