I believe that there are no coins to beat bitcoins in next 10 years or more .
As you know when bitcoin is down , all altcoins (including ETH) are deeply down . Almost altcoins are based on bitcoin tendency.
I truly believe with you no one can beat bitcoins for how many years,it is because bitcoin is the king of all cryptocurrency.The price also of all coin are to big difference also even the ETH that why no one can surpass bitcoin.