The thing that makes bitcoin risky, is it's history. For the first years, bitcoin was mainly a tool for black market trade, and there have been plenty of situations where a large number of coins have been stolen by computer crackers and confidence man.
Yeah, and? What, a large volume of traditional currency hasn't?
This creates this situation, where in all probability, most of the coins are actually owned by criminal minded people.
Some more BS pulled out of your ass. What gives you the impression that criminals are sitting there hoarding their bitcoins? They're probably cashing them out ASAP to pay for their criminal activities and rich lavish life styles.
To invest in bitcoin, means that you are trusting these anonymous criminals to hold their coins, instead of dumping and acquiring your wealth as their own. No serious investor will take this risk with serious sums of money.
Second Market? Trade Fortress? Winklevii? This isn't looking too good for you.
I think that this will mark the final demise of bitcoin,
What about the crash of 2011? 2012? 2013? GTFOH.
when the regulators see that you can't have any certainty about the past history of bitcoin. It means that there will probably be a new digital currency,
Like the hundreds of alt-coins that already exist?
that will be sold from an already regulated market system and by that, creating a more transparent and trustworthy ownership history.
Try harder.