2018 is yet another promising year for Bitcoin and other cryptocurrencies. There will be more adoption moves from the mainstream which will push the price even higher. Companies like Amazon and other retail and ecommerce websites are likely to embrace Bitcoin in 2018.
You seem to be very confident with that statement and if that or one of those big companies implements something of that kind then surely the price will remain in good position almost as it has been happening so far in the last year that has just elapsed,so maybe is very possible that in this new year that is just beginning the price may decrease a little more although I do not think that much, but at some point it will have to recover finally,back in the middle of the year maybe.