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?
First BTC was not discovered it was invented by Satoshi Nakamoto, I don't have the intention to discourage you, it's just, that I thought you should know the difference between invented and discovered, if you already knew then never mind my comment.
I don't think there would be any other coin that would compete with BTC because BTC has 50%+ dominance which means it has the most dominance over other crypto or to emphasise the importance of this we can say, it covers half of the market cap of the crypto industry alone.
To compete with BTC, many coins have to spend years just like BTC did, even the forks of BTC were not able to compete it while they were the advanced and improved versions of it. ETH comes at second number but still it can't compete with BTC because of volatility of BTC.