If Bitcoin dominance is more than 50% it means bitcoin is in more demand as compare to other currencies. Its a sign of bull run of bitcoin. Earlier this year there was a big rise in bitcoin's dominance with so-called alt coins falling back across the board ahead of the bitcoin price rising to highs of $8,400. We can see again a upmove in bitcoin price again.
Bitcoin dominates his market ever since simply because its the top coin and every investors believe on bitcoin. If all the people used bitcoin now, we will see the price to rise again. This is a great study about bitcoin domance, and this is why i dont buy shitcoins becuase they cant survive in this market while bitcoin remains on top.