It is not reduced. It was 62% few days ago and now grew to 65%. Bitcoin dominance is growing again. I suspect this to keep going until price of Bitcoin will not start growing again.
We are in a state of flux. The last time I checked, the Bitcoin dominance was 63.8% and it is hovering between 62% and 65%. The altcoins have managed a major comeback, after getting pushed in to a corner as a result of the rising Bitcoin market share. Many of the top altcoins have gained as much as 30% during the last few months. However, a plateauing has occurred and I don't expect a further rise very soon.