I think this is due to the increase of bitcoin, and the issue of Bitcoingold after segwit, nowadays very appropriate to do stock coin cheap coin, finished segwit sure other coin coins there will be rebound
I agree, Bitcoin is outperforming most coins at the moment so all the new money is pumping in there. It is very possible to have a bit of a sell off in btc after the fork as people cash in and look to pick up cheaper coins elsewhere.