My opinion is that altcoins are still dependent with Bitcoin. We can prove that by looking at the most recent bearish market. Bitcoin's price is also dragging down the altcoin market. Altcoins are still growing and maybe in the near future, there is a huge possibility that they will take control of the market. For now, I can conclude that Bitcoin is still on top.
As of now bitcoin is the king where as it is used in transaction in order to buy altcoin, the dependence of altcoin to bitcoin is one of the proof that tells bitcoin is still on top of crypto currency. And also as the price of bitcoin goes down it also goes down therefore there is an effect in changes of bitcoin to the altcoin. Moreover bitcoin is more known of people that altcoin, so if the markets boost more probably bitcoin will continue to rise on top.