Bitcoin falling is not an unexpected turn of event. It happened before and ot could infact will still happen again. its a normal in anything called trading. Also, other altcoins do recede as well only that we dont get to here much about them due to their unpopularity. But be rest assured bitcoin will rise again. As for Ethereum catching up with bitcoin, Not in the nearest future. Though it has its own prospect and possibilities.We can not say anything about anyone crypto currencies, because how Ethereum increased in value and BTC decreased in this week this is incredible. So these currencies are most unpredictable and variable in values. Especially BTC no one was expecting this at all concerning BTC price.
But now it's early to say, may BTC will bounce back.