A large portion of Bitcoin buyers are still fiat minded. They see it as just another fiat investment and thus it moves with the market generally while longer term goes from strength to strength (in fiat terms) due to the actual Bitcoiners refusing to sell and the inflating away of fiat's value.
Discussion
This is a big problem. I think that only the collapse of the FIAT edifice will compensate for this unfortunately.
I don't see it as a problem so much as an inevitability. It's a problem if you need to sell some BTC for some reason (which happens) and the price has been hit for some fiat market reason. If you're HODL'ing and don't need to sell, it's just a number on the screen.