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 
I would say by the end of this month! Yes, bitcoin is sort of unstoppable right now, and that is of course a good thing for us. The more users that join the bitcoin network, the higher it will push the price up.
so we can not say where bitcoin stop. It always goes up.