I think the main reason is the US beat Syria. This is the main reason that has pushed up so many altcoin prices. People are pouring money into the Crypto market to hold their assets in BTC. So altcoin prices have rebounded in two days.
Bitcoin was the first crypto currency and Bitcoin is being adopted very fast as main stream and people believe in 5 years it shall become mainstream.Bitcoin holds 50%+ market capitalization of all crypto currencies.Digital Currency Next generation of money and has tremendous utility