Now the mainstream currency, BTC-ETH, has the upper hand, and they have the strength and technology, but the future is likely to be a new project to replace them more mature and more comprehensive. What do you think it would be?
The king from the beginning until later is still bitcoin, can not be defeated by any coin because it has the highest value in this market.
Almost all the main choices of any beginner or professional investor are bitcoin. So, it takes a lot of effort for competitor coins that want to beat bitcoin.