Do you want to invest in the "currency" think Yen, Pound, or Dollar...
Or do you want to invest in the technology that processes transactions in those currencies. Think Paypal, Square, Visa and Mastercard.
The first company that comes to market that easily allows you to utilize crypto currency transactions at the mall will be the winner. Visa for example gets a small % of every visa transaction. If Visa or paypal or whoever creates the technology to use bitcoins, ether, ripple on the market... WINNER!!!
Why invest ("gamble") on the hopes your currency will rise/fall. We all agree crypto currency will come mainstream eventually. Why not invest into the companies that will profit once the prices stabilize and it becomes more accepted?