I think that bitcoin already has a big price for one coin, so it will not have much growth, and from the etherium the younger coin will be still growing for a long time and will show us very great heights!
In my opinion, bitcoin is just sleeping and letting the altcoins grow a bit. It will be back again and reach a new all time high, it is just playing defense from the recent events in cryptocurrency. Got this article and it is worth reading.
https://www.coindesk.com/15000-bitcoin-defensive-bear-grip-strengthens/