My answer to the principle is: NO
Bitcoin is money, the value of money is built on confidence, tradition and security, attributes that Bitcoin offers easily. The analogy between Bitcoin and social networks is completely incorrect, people think that Bitcoin is an myspace that will be replaced by facebook. It turns out that Bitcoin is money and not a social network, so this comparison is completely wrong.
Most of mankind's wealth resides in vaults for hundreds of years, so the circulating medium is derisory close to it. Why are we going to need fast, no-fee coins if we can use paper money and banks? Bitcoin's purpose is to be a safe asset, scarce and superior to gold. What is behind Bitcoin is the fact that no politician can steal you through taxes or inflation, there is nothing safer than Blockchain and Bitcoin. So far no technologically superior currency has emerged to Bitcoin to the point of provoking an abyss between technologies and will hardly emerge.
BUY BITCOIN TODAY AND ALWAYS.
I don't think so. Maybe there is a very small chance that bitcoin will be outdated by another cryptocurrency. We all know how powerful and well built bitcoin is and the possibility that things will change in the future for it is very little. We should keep our hopes high for bitcoin knowing that it wouldn't disappoint us for sure.
it is difficult for altcoin to replace bitcoin as main cryptocurrency.although we know in market appear new potential coins, but it will needs long time to replace bitcoin.