Bitcoin is a decentralized currency It is very difficult to say whether such coins like Bitcoin will be discovery in the future. But in my opinion such coins will not be another discovery.
What is yours opinions?
Back in the days, black and white TV was popular in many homes, offices etc. but gradually colour transmission TV took over. Right now, smart TV is leading the market and it might be dethroned in future. So if there's anything I've learnt about life is that nothing is impossible. Bitcoin is a revolutionary coin that ushered in other altcoins, and I'd say Monero is the only coin that came close in comparison with Bitcoin because of its enhanced privacy and security. However another coin might surface in the future.