it is not going to happen unless you stop calling market cap dominance
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otherwise as long as people use market cap as dominance and as long as it is super easy to create billions of shitcoins by clicking a button then bitcoin's dominance will continue to go down. by 2020 at least we will see 10000 altcoins with a total supply of probably around a thousand-trillion and bitcoin even with its price at $1 million won't even be able to have a market cap to compete with that much supply.
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Is this true? I mean, I heard similar explanations before but I always doubted them. If it was so easy to create a sh*tcoin with whichever marketcap you want, why we never see any of them in the top 20 on CoinMarketCap? I'm not sure if I'm right, but I think that it's not that easy for your coin to be even listed on CoinMarketCap.
For example, when you want to add a coin you have to answer the question:
Is the cryptocurrency currently traded on at least 2 exchanges listed on CoinMarketCap.com?
And if the answer is No, then your coin will not be even considered for adding.