the adoption rate versus selling needs to be increased for the prices to grow up and which is happening for bitcoin since it was in the market
Real world adoption is happening but not like how internet or mobile phone technologies were successful in more quicker time. It is not easy to convince all types of people to adopt an ALL NEW MONEY. But, we can believe adoption rate too may grow in exponential as common people are tend to listen to their near and dears. By considering these all, one million dollar levels too will be possible in more quick time than we could estimate.
do you think bitcoin can reach 42000$
Definitely it will reach but the question of time-frame is the mystery. This is the reason almost all positive predictions about bitcoin will be successful but time based ones may not.