I wouldn't count on Huang and Lan. While Ink was busy destroying the world and greating a huge, unstoppable army, Huang and Lan were just playing around for a million years, doing nothing worth noting. They could have kept creating more divine spirits, just like Ink created more and more Ink clan, including those hulking ink spiritual giants, but they did no such thing. Instead the dragon and phoenix divine spirits are all but extinct. It's not an exaggeration to say Huang and Lan couldn't care less about the 3000 worlds and wouldn't mind to see them destroyed. Perhaps they know it's the right time for the universe to end, so that it can be born again later, from the beginning.