We could say that EVERY altcoin is dependent on Bitcoin one way or another. That's because Bitcoin is the one cryptocurrency that started it all. Without Bitcoin, none of this would've been possible today. It's the reason why every crypto exchange lists an altcoin with Bitcoin as the main trading pair. Being the reserve cryptocurrency itself, gives it a huge advantage over its competitors. Unless a new cryptocurrency with a new technology superior to Blockchain comes out, I don't see any altcoin becoming independent from Bitcoin anytime soon. Just my thoughts