Cryptocurrency is future. Not only BTC. In future we will see more new cryptocurrency.
Yeah i think that we will be see different new currency in the future and they will be rise and shine as bitcoin but i am sure bitcoin will be on top of all crypto currency because people trust in bitcoin and adopting bitcoin in huge amount.
And because of that we will also see a lot of nonsense coins that are going to pop out and will make millions of money for their ICO's. Even though there are trusted crypto's especially bitcoin, for sure many are going to keep on using it as an alternative way of purchasing stuffs and as an investment, better to say that digital money is the future money.
Bitcoin is different from other digital money, it's digital but decentralized so people love it than others. I like Bitcoin actually because it gives me privacy so I believe it will going to be the most dominant digital currency in the future.