Although, bitcoin continuous to show its roller costar rides from last 7 months. But dominance is slowly increasing to the upwards from past 3 months which could be a sign of a very good rally till December 2018.
Rise in the dominance means bitcoin is more in demand compared to the alt coins. Expert says that it could be a sign of bull run, as it's a common route for fiat money to enter the crypto market.
Point to note that total number of bitcoins are 17,202,725 as circulating supply and already 17,202,464 bitcoins have been mined. Only 48 bitcoins left which are going to be mine within years.
Earlier this year there was a big rise in bitcoin's dominance in January 2018. However, time will tell the truth as conditions were much different from the last time when bitcoin's market dominance was above 50 percent but fortunes are in favor of bitcoin for the next 6 months.