I'd say there is a potential argument to be made for the endless supply of altcoins being mined. With established currency's such as Litecoins and Bitcoins dominating the marketplace and being the fore-runners in cryptocurrency innovation, it does seem kind of pointless for the random currencys like BossCoin to exist. However, mining makes perfect sense for the mainstream currency's, as it is what insures the blockchain moves forward and new coins are created. Its essential.