It's very simple one. The price of bitcoin is vary based on the demand in the market.When the demand of bitcoin goes beyond the expected one. The price of bitcoin will reach the moon. But the price is not a stable one, It will vary with demand.
Actually, this give a opportunity to us to buy at some low price . We have to hold till the market regain. Finally, we can sell that holding to get some profit from it. So, both raise and fall in the price of bitcoin is good at some point.
Agreed. if you have enought money and, what's more importanat, patience, so any price movement will be good for you.
BTW, I did not like the article. Too much speculation in it and too little argument.