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I don't think the alternatives coins will replace bitcoin because it is first digital currency in the world, the good possiblity on 2020 is bitcoin will be money in internet and the price of bitcoin will be more expensive than right now. Don't forget the bitcoin is the king and the other alternatives coins is just copy cat of cryptocurrencies in the world to be more better for the world.
Even in 2030, no altcoin will replace Bitcoin, maybe some 50 years to come before that can be possible.