Sorry, what? this is literally untrue, and pure bullshit.
Anyone can buy any of these at any time already. There are online marketplaces that trade these things 24/7.
The only restriction is that a potential investor has to prove that they realise that the value of an investment can go down as well as up. That, in other words, they're not an idiot, and won't demand that the government "do something about it" when their investment tanks.
Of course, because of that niggling little regulation, you can't spam everyone with ridiculous promises of untold wealth if they'll only invest their life savings in the latest ponzi scheme. Until ponzicoin came along, of course.