i think Bitcoin will continue to dominate the entire cryptocurrency world for some years before another coin overtake it. It will also remain to be the primary means of of exchange because of its popularity and majority of exchanges are using it buying altcoins and The market dominance of bitcoin will continue forever till the usage as well the adoption from common people continues. At some point there might be hurdles that needs to be overcome by the community, because every government doesn't understand bitcoin in the right way.