This is potentially high. At present it is very good, but it has been created very long. So to compare technology, the bitcoin will not be equal to the new coin altcoins are developed in the market.
That is not possible. Bitcoin has one of the huge market caps and it has been the top trending coin since a decade. Besides, ETH which is a very potential crypto cannot even cross Bitcoin in coming decades let alone other crypto. Having said that, Bitcoin will go one ruling the crypto market and might even outshine US dollar if it is recognized by countries all over the world.