that's not how it works. having bought a lottery ticket was still not a good idea even if you won. meaning, bitcoin is still a risky asset, like back then, there is no reason little reason to reliably assert that it will still go up, and not down.
Obviously don't put your life savings in bitcoin, anyone who does is not making an intelligent choice. But if you have money to spare that your willing to lose, I wouldn't consider it a horrible investment.