http://i64.tinypic.com/dh4xx.jpg
Source: (https://coinmarketcap.com/charts/#dominance-percentage)
Any ideas about why this is happening?
IT might be because that people are now starting to believe in bitcoin in a way that it is becoming more palatable than other cryptocurrencies just because of its longevity and that it is still higher than some of the other currencies. It might also be that the influence and popularity of bitcoin is spreading.
I think the hype of the fork is coming into effect. The news about Bitcoin Gold and the value or profit that a bitcoin holder can take once fork is done. Probably greed is driving Bitcoin market upward since more bitcoin means more coins on the forked chain which means a profit for them.
On top of that the crypto market is getting bigger since Bitcoin is in the news almost every day now.
This could be a major pump after the fork or a dump. Although bitcoin cash fork was made, does it become reliable? Does it improve? What will happen after bitcoin gold? People are still sticking to bitcoin because many investors are buying bitcoin because of its known popularity today. Many people are still asking, what is bitcoin? I think crypto market will still rise in the future