Bitcoin has been steadily losing market cap dominance, from 90%+ just two years ago to ~80% today.
When it comes to exchange dominance it's just 66.4%.
This trend will probably continue and in a few years there will be people using cryptocurrencies that do not know what bitcoin is.
Read the handwriting well bro, they are altcoins, lool alike and will fade overtime. Let me ask you a question, those alts company, why do they collect bitcoin too, since their alts are high and mighty. Every alt company are making value to acquire more BTC because they have already realised that BTC is king and unbeatable. Altcoins are just there to enable us acquire more bitcoin so don't let anyone deceive you. BTC is KING