I think everything about Bitcoin investment is about personal decision. Because each and everyone of us here have different target, but even as that I don't really think a good investor would have such thought of retirement from his own work when Bitcoin Hit $1 million. Unless you are not comfortable with the work you are doing, if not there is nothing wrong when someone is working and also investing.
The amount that the OP mentioned is kind of huge, but I agree with you that everyone investing in bitcoin is having their own personal decision, everyone is having target of when they are planning to sell their bitcoin. I don’t think we are suppose to retire from bitcoin even when bitcoin hits a particular price, but am sure most people will end up selling some of their bitcoin which is normal, we can’t be holding bitcoin forever, time will come when we will be selling even when we are comfortable with our work, but all I know is that not everyone will be selling everything, and as people are selling, people will definitely be buying back.