Bitcoin can never be dethrone as long as there is a lot of people using it and also miners that sustaining the network. Even there is a lot of altcoins you can see the domination of bitcoin in the market by looking at the price move of the altcoins now and they are mostly dumping because of the price rally of bitcoin, so i don't think bitcoin is very easy to dethrone.
never say never.
because that just makes people lazy, give up trying to grow/protect bitcoin because they feel it can never break.
nothing is too big to fail.
all it would take is barry silbert to tell coinbase and bitpay to release merchant tools to make merchants accept litecoins for instance.
then the swing and snowball effect will take place.
im not saying all 5mill+ regular bitcoiners need to jump up and do something but those that do actually care should start thinking critically at the weaknesses and make them strengths and stop thinking of the unicorn utopian dream of fluffy clouds when sitting on their hands
i am laughing at how most people talking about the dethroning, in regards to market cap.. rather than utility.. i think those kind of people should just admit they dont care about anything more then quick fiat profits. and stop pretending they care about bitcoins longevity