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?
You've correctly noticed that BTC and ETH have an advantage and they have power and technology. And strength and technology is more about trust and demand from the community. Thus, when the developers of any promising project will be able to prove to the crypto community that their project is necessary and profitable in this market, then people will gradually switch to new projects and forget about BTC and ETH leaving these coins in the background. To date, such projects are not available, so BTC is still the king of our entire market. And I can safely assume that this situation will continue for a long time.