Of course it will. Until we get more fiat/altcoin pairings, the whole market generally follows Bitcoin - if Bitcoin gets hacked, everything dips. You can already see red across the board if you go to coinmarketcap right now.
Uhmmm, the thing is bitcoin is always going to be at the top as it is the main cryptocurrency. In order to get into other cryptos you need to buy bitcoins first thus raising it's dominance, in order to get out you need to sell alts for btc. Thus bitcoin price will always affect crypto price
While this is true at the moment, it won't always be the case. With more exchanges like Binance and COSS starting to introduce buying alts directly with fiat, you won't always have to buy Bitcoin first.