The dominance should continue simply because the fact that when institutions enters the market, BTC will be the first crypto they hold.
Bitcoin has dominated this market for so long. So I don't think that someone will just arrived and took the market by storm. And just by looking at the trading volumes either in bear or bull market, bitcoin still remains the crypto King so obviously the dominance will continue for many years, specially when institutional money enter the market next year.
with the volume of bitcoin reaching 30% of the total volume, I think its bitcoin is difficult to pursue. so it is not surprising that bitcoin is the leader of other coins, so what happens to BTC will affect the development of other coins. when the BTC price falls, the other coins also fall and vice versa