If you are so convinced of that it's a bubble, I challenge you to do what Spiegel had the courage to do. Short it!
Shorting anything is an extremely high-risk gamble. I'm not a gambler. And I advise others not to gamble either. The problem with short-selling is that you have to know two things: That a security will fall, and exactly when that will happen. Because if your timing is wrong, the brokerage will close out your contract. You lose the bet even though you were right that the security would eventually collapse.
But the ultimate demise of Bitcoin isn't even the real point. The real point is that speculation and crime are its only significant uses. Sure, you can buy some legitimate things with it. But that's an infinitesimally small part of its use.
Blockchain was programmed to fail: To paraphrase Karl Marx, blockchain contains the seeds of its own demise, because it must be maintained in its entirety, forever, in multiple locations, as it grows larger with every transaction, and the source of its funding (a limited number of unmined coins) shrinks.