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.
I disagree. On all cryptocurrency exchanges, Bitcoin holds the most critical position. Everyone will never forget the existence of bitcoin. The volume of bitcoin trading is down because there are too many coins created each day