Bitcoin and Ethereal both equally found a decrease of about 8% on today i'm not worried about this decline because there will be a big jump that will happen in time that isn't long.
what needs to be change to make Bitcoin and crypto currencies to go to the roof again ?
We don't need to change anything what we need to do is buy and hold. If possible, do it simultaneously all users may (if possible).
is it likely or unlikely to happen?
Very likely btc will return maybe after the current decline.
how much you predict Bitcoin and Ethereum till the end of 2018 ?
This year it is predicted that bitcoin will reach $ 30.000 while for Ethereal it may reach $ 2.000.