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?
BTC is still king and will remain king for coming few years.ETH no doubt having innovative smart contract feature but still can not surpass BTC now but in future if ETH is bringing some more updated innovative feature then BTC can be overthrown.