Yes, the bitcoin is an amazing concept, and it does have its advantages but,

If the alternatives keep on coming out,

such as litecoin, feathercoin or dogecoin,

Are we going to see the value of all digital coins decrease? Because the "supply" of the "supply and demand" increases? When bitcoin was first invented, the creator made an arrangement so only 21 million bitcoins can be produced, in order to prevent the "supply" increasing forever. But all we have to do is create another type of a digital coin with the same concept as the bitcoin... such as litecoin or feathercoin.

Or am I missing something? Are there any reasons that the value of those virtual currency will keep on increasing? Even if different types of virtual currencies keep on coming out?