I think it will.
it's up to 25% of BTC marketcap and doesn't look like it's going to slow down. There are literally HUNDREDS of apps now being written for it. It wouldn't surprise me if it happens towards the end of the year.
I suppose the general question is "Are smart platforms more valuable than raw currencies?"
I don't think that Ethereum will ever overtake bitcoin in its market cap, ever.
It is simply because the fact that bitcoin is the first cryptocurrency, it will always be known as the first cryptocurrency. No cryptocurrency has the reputation and age of bitcoin, simply none.
Also if you haven't noticed bitcoin market cap has grown considerably as well, from 10 billion USD to more than 22 billion right now. Bitcoin has more liquidity than bitcoin, bitcoin has way more users than bitcoin, and more "apps" that are built with bitcoin integration. I don't believe that just because you are able to build decentralized applications on Ethereum, will mean bitcoin will be overtaken.