I am kinda worried about one factor - rate of Bitcoin adoption. It seems like adoption slowed down significantly during last year, and sometimes even reverted (Steam is no longer accepting BTC)
Metcalfe's law states that the value of a network increases as the number of users on said network increases. So the number of users we have, affect directly the price BTC
Adoption is somewhat stagnant - no major company is talking about accepting bitcoin as a payment method - because they know that people are not willing to spend their coins anyway.
I am worried that "hodling' mentality of Bitcoin users, in the end, will be a very big problem and the reason for low BTC adoption.
If you're a long term holder or have a high cost basis, you should be worried about this. What's more worrying still is that the "users" that spiked the price last year were nothing more than speculators looking to get rich. Compared to the number of people buying bitcoin, the number of people actually using it is only a small fraction of that. Metcalfe's Law contemplates value related to legitimate utility, which speculators don't play much of a role in, if any. The spike we saw in 2017 was not sustainable and not legitimate use of the bitcoin as a currency or medium of exchange, which is where any value under Metcalfe's Law would come into play. And you can see presently why you want actual use over speculative use, because actual use represents more permanent value creation and speculative use represents unreliable and unpredictable value creation. The price crash we've been experiencing for 6 months is attributable to the loss of speculators from the market. Without that buying demand, price cannot be sustained.