There is no time is right to buy Bitcoin you can buy when you have the amount of dollar you want to buy with, there are people who haven't heard about Bitcoin yet but if in future they hear about it they will be interested to be an investor….will you say is the right time for them to buy or not the right time due to the rapid increase in Bitcoin one can choose to buy now that is right time for him others can choose to buy tomorrow that is right time for them.