So, what?
What you have just said can be said about any investment: we can’t predict short term but we can long term if it has good fundamentals, and past performance can’t be used as an algorithm to predict future performance.
Yes, but a lot of people cling to the delusion they can predict the price in the short term. That only happens rarely with deep insight and perhaps even some insider knowledge of the market. (like gox being insolvent or maybe tether collapsing).
Mostly, if you tried to predict the price in 24 hours, you just wouldn't be in the ballpark most of the time.
For example, I could guess that the price tomorrow is likely to be 6300 and I could as easily guess the price would be 6050. Or any other number.
But the price tomorrow could be 4,000 or 7000, or it could even crash to near 0. The technology would still exist and the benefits of cryptocurrency would still be realized, my profits would be dead and I would be a schrodinger's cat.
It happens in the traditional market too, there are a lot of companies that were huge that have simply disappeared. They get dropped from the index and we only remember the victors.
I guarantee you that if you do research, you'll find that huge companies have dropped out of the S&P 500 and disappeared. We shouldn't act like this somehow does not or will not happen in crypto.