Bitcoin has not just been a trendsetter, The currencies inspired by Bitcoin are collectively called altcoins and have tried to present themselves as modified or improved versions of Bitcoin. While some of these currencies are easier to mine than Bitcoin is, there are tradeoffs, including greater risk brought on by lesser liquidity, acceptance and value retention. Since Bitcoin prices are soaring new highs, we look at six cryptocurrencies, picked from over 1000.
Simply, the growth of this coins are dependent upon its usability, technological advancement and there circulating supply.
Below given is list of altcoins who have a potential to surpass Bitcoin in future...

1. RIPPLE (XRP) : (Latest News) MoneyGram, being partnered with Ripple to implement Ripple’s XRP coin in their payment flows to lower transaction costs and increase payment speeds and has a lot potential to surpass Bitcoins in 2-3 yrs.

2. ADA (Cardano)

3. Litecoin : Although Litecoin is like Bitcoin in many ways, it has a faster block generation rate and hence offers a faster transaction confirmation. Other than developers, there are a growing number of merchants who accept Litecoin

4. Lumen : Basically, an advance version of Ripple, working on C-2-C transactions

5. Sia