We need a service like CoinBase that will make it easy for the "grandma" investor to be able to buy BlackCoins without the extra steps. We as a community need to come up with a solution for that in the near future.
Why would "Grandma" want to exchange fiat for blackcoin to buy things she could buy with fiat in the first place ?
Let's not kid ourselves here, if you're trying to target Grandma or even average Joe then you're targeting the wrong demographic because using anything but fiat would be an inconvenience to them and they will not appreciate the value of crypto currency over the current shackles of fiat.
To make crypto's successful we need to bring in more people from the tech world first to pioneer these currencies before we get the general populace on board, if we had it so kids badgering their parents couldn't buy the latest games or technology without having crypto's to buy them with then it would essentially go a hell of a long way to breaking free from fiat which is the core ethos of crypto's.
Target indie developers, bring those people on board because they are the future for the ever expanding tech world and technology is the future