I don't know what bitcoin price will be by DEC 2019 but one thing is certain,many new developers and companies are already using the block chain technology which is good for crypto world and this means that bitcoin price will be more stable than we've seen on the past so I'm less worried about the future of crypto
Its not about stable.
The OP is asking for a clear short prediction.
But according to me we shouldn't think about future atm.
Right now BTC price is fluctuating.
But the price will increase, i believe. As many people are getting to know about Bitcoin, so gradually the price will also increase.