Its currently sitting at about 53%. Its simply mind-blowing that even at record prices for BTC, all the altcoins are rising at break-neck speeds, which I assume is largely due to the dark hand of Wall Street. And as BTC is simply long overdue for a correction, I suspect BTC's dominance could fall within a matter of weeks, if not days..
"To HODL or not to HODL, that is the question." - Shakeyhandspeare
In May and June, I think the bitcoin domination was far below 45% I remember this from coinmarketcap website. Bitcoin won't give the driver seat to the other altcoins. It will maintain as the dominating factor of the entire market.