Without btc alt coins would no longer exist, and all of tokens when converted to real currency undergo to btc. This makes btc become popular and continually increase its value. There's no doubt btc is the most strongest digital currency ever made by mankind:)
That is true BITCOIN was the first coin that been made and with out bitcoin and the success of bitcoin there will be no altcoins and until now bitcoin still have the biggest value of all in the market.