OP you should have at least outlined some of the many real negatives and risks with cryptocurrencies.
* high volatility
* the weak security of the various exchanges
* the legal gray area, opposition from governments
* mining is pointless unless you have decent computer power and don't pay electricity bills.
Trading bitcoins isn't investing, they are not regulated at all, you have zero recourse if anything goes wrong. If the company that holds your wallet goes bust or gets hacked that it.
Behind the Biggest Bitcoin Heist in History: Inside the Implosion of Mt. Gox
They don't provide any income like stocks do. The price could easily halve in 1 day.
One 1 or 2 of these cryptocurrencies will stand the test of time ( if any), and the others that don't make the cut will be worthless.