even when attacked from the inside by blockstream/core it just forks and offers two chains. at least one will continue delivering p2p electronic money to the people with low fees. maybe both? we'll see. 
People leave bitcoincash because their block is still not perfect, so they prefer to go back to bitcoincore. And I'm sure bitcoin will reach $ 4000 by the end of this year 
At this early stage of the BitcoinCash (BCH) life, there is no question that it is not par with the first and the original Bitcoin. In fact, Bitcoin is taking the spin-off of BCH as a cue for its more growth right now. People can see clearly the difference and as clear as sky this is the reason why BCH holders are selling their coin share when it is already possible to do so. I have sold mine in Bittrex and I am still thankful for BCH for the free money, anyway.
There is an upsurge of price for Bitcoin right now and this can be expected results of weeks of waiting and after all the FUDs are gone for good and were proven just to be baseless fear Bitcoin is now back with revenge. However, we have to be careful as there will always be corrections along the way.