I feel pretty strongly about bitcoin doubling or more during 2018. It still has strong support in the 13,5k area plus as more and more coins become available it seems like the "mainstream" exchanges and even the new crypto debit cards typically prefer bitcoin to be the medium of choice for payment/deposits/ etc. So for example when some newer coin comes out and their is significant interest in the token or coin the markets seem to facilitate the use of Bitcoin in order to purchase that particular coin and in addition the solutions presented for the "under-banked" also furthers the use of bitcoin. Just my humble two cents.
Dave