As we notice that almost all the altcoins follow the price of bitcoin . I'm just wondering when they will become independent and don't follow the bitcoin price?
I think this is very difficult for the Altcoins. Unless there is a strong enough Altcoins to beat Bitcoin and lead the coinmarketcap table. Probably not likely this will happen and the Altcoins will depend on Bitcoin.
They will not stop doing it for many years more. Bitcoin will remain the most powerful cryptocurrency for long. I am not even sure that some crypto, better than BTC, will ever appear.