You know the drill. When Bitcoin rallies hard, altcoins dump. When Bitcoin dumps, all the rest dumps too. But when Bitcoin is sideways, altcoins rally and some go their own price action.
Everyone in this subsection of Bitcointalk is waiting for altcoin season to come again. Some have already given up.
I will try to post my observations about the market relationship of Ethereum which is the current lead indicator of altcoin market health to Bitcoin's.
altcoin prices are currently mostly influenced by bitcoin prices, so when bitcoin prices are dumped, altcoin will also follow it and when bitcoin pumps, but not all altcoins will experience pump prices even there are some altcoins which tend to actually decrease in price, and this is usually caused by many traders who sell their altcoins with BTC pairs, thus, pushing BTC price up in the market.