I think more than 40 k is possible.
I absolutely sure bitcoin price will up in 2018.
I also believe bitcoin will reach $40,000 but nothing is absolutely sure. Now time confirmation of Bitcoin is a big problem, it takes too much time.
This has been predicted by lot users who have got a good understanding about the market. $40000 seems high, but when we calculate the growth it has attained $40000 is easily achievable. I believe that the price will reach $40000 before the end of the upcoming year.
Predicted by whom? That price is so huge and needed more people support to reach for that numbers, But we never actually knew on what will happen on it since their so many speculation,fuds,hypes or anything can be implant on bitcoins ecosystem by that year comes. And let's just put our trust on the bitcoins system since we all know we might gonna see some major huge changes.