2017 is a super charged year for BTC, and now standing at 11000, I would say if there will be no strong negative news, we will no longer see price below 8000 any more.
2018... the war between btc and bch will heat up, this may create some volatility. but combined BTC BCH BTG value may go above 20k~30k.
That particular war is already over as far as many are concerned.
They had their chance in the earlier days with the EDA swings and super pumps. Plenty of exchanges are reclassifying it as bcash which'll seal the deal.
Bitcoin is about to reach the next level of legitimacy and everything else will be trailing it.
BCH isn't going anywhere but it isn't superseding anything either.