The value of altcoins are determined by the value of Bitcoin. Do you think one day altcoins can break free from the Bitcoin strong hold?
Even in the current situatiin whereas some altcoin is booming up, I don't think that it can topple down the bitcoin. Bitcoin is the foundation of the cryptocurrency and price of altcoin is depending on the price of bitcoin. So I don't think that it would be surpassed by other coins.