Suppose it all goes down to what you mean by long time, if you mean a year or two then holdings not a great plan, but if you are talking 10 years or so then holding Bitcoin is a very good idea. In 10 years we will see much much higher prices than now so you would make a lot holding for that time period
I know that Bitcoin has achieved many times over the years, so it was very little known before about Bitcoin, but now it seems to me that most people know Bitcoin. So it is still possible?