Bitcoin is still the king of cryptocurrency and the rest are just alternative coins. All the profits of this altcoins are just the faucet for the bitcoin to go strong. I do not really know what is the scheme for bitcoin and other altcoins but i bet that these altcoins are basing bitcoin market price movement. And that is why bitcoin could never be dethrone by other crypto but altcoins could achieve what bitcoin has achieve and i am seeing ethereum has a lot of potentials but it cannot dethrone bitcoin for now.
It makes sense to be used as an excuse to strengthen the current bitcoin even in the future because everyone who trades or invests altcoin has only one main goal to get more bitcoin from the benefits of investing in altcoin so that with the goal the bitcoin will not be able to be surpassed by altcoin as long as it continues to be the main objective of the investors to earn profits in the future.