In reply to subtle:
> I see millions of crypto cash has disappeared following the death of Gerald Cotten
> I'm glad I didn't have any money to invest in this
> Will this be the end of emerging crypto currency as people pull their money out of it or will it continue to be a "thing"
Note that the money was lost from the exchange. It's like putting your money in a dodgy bank, and then blaming the money for getting lost, instead of the dodgy bank.
It's also interesting you mention 'invest' and 'currency' in the same breath. They are not really compatible. A currency you want to be stable, liquid (i.e. it's flowing, people are not holding onto the entire supply), and an investment you want to be growing and you want most of it to be held. When I heard this, I realized that 'investing' in a currency is actually making it fail as a currency.
I'm 99% sure that crypto currency is here to stay, but it may not be bitcoin that lasts. A good analogy is that these crypto currencies (and the resulting bubble) were just like the internet and the dotcom bubble. People probably said the internet was a big fad after that crash too, and probably 99% of websites/companies made at that time don't exist anymore - but yet if you made the correct pick, you'd be a billionaire from google stocks.