Exactly. We could never know the real value of a Bitcoin within a few years from now. It could be worth either thousands of dollars, or zero dollars within an instant. Its high volatility can either make you rich or poor before you know it. That's why, even if it's good to hodl some Bitcoin, it would also be wise to spend it before it becomes too late (if value declines massively). By spending your Bitcoin, you would be contributing to the crypto economy and allow other merchants to grow over time. But, if you decide to hodl your Bitcoin for a long time, then you should proceed with caution as huge price increases are not guaranteed.
Hopefully, that's not the case as we might be able to see Bitcoin become worth $20,000 by the end of the year. There's so many exciting stuff coming along such as The Lightning Network, and sidechains which will make Bitcoin stronger than ever before. The Lightning Network will have a huge impact over Bitcoin's price in a positive way, and interest will spike at a greater rate than last year. In the meantime, Bitcoin prices are relatively cheap and could be worth buying and holding for the long term. Just my opinion