"All Ponzi schemes eventually collapse, of course, when sufficient amounts can no longer be raised from new investors to pay off earlier investors.
The same will occur with bitcoin and all other cyber currencies, except perhaps the ICOs. Investors will pull back from buying cyber currencies, causing their prices to begin a sustained decline.
That downward spiral will accelerate as cyber-currency “investors” try to bail out before prices plunge even more."
Not sure 2018 is the year this happens, but we had 5 waves. I think it's certainly possible. It went mainstream. Without sharks manipulating the price it won't get new investors. If sharks come in to rip off the public that's still interested in buying cheap, I'll keep trading it, otherwise I'll move to the next potential bubble I have identified.
At that point I just want to be able to say "I told you so" in a few months or years.
So I'll keep watching crypto, even if I don't trade it anymore.