I for one welcome our new Night Kingdom overlords.
Flashback to the 1950s: Disneyland was almost universally panned when it was proposed, and then when it was opened. Many scoffed at the idea that someone that Walt Disney would open a tacky and dirty theme park. You could do any of the rides Disneyland opened with somewhere else. But the difference is that Walt did them
better. Even though Disneyland opened quite disastrously, in a number of years it picked up, and now has spawned a travel empire encompassing the world.
Back to Night Kingdom: Though you can do many of these attractions elsewhere, I have confidence that Disney can do them better and just differently enough to pack the park every night. It's a very low risk venture anyhow, with most of the cast from AK switching to NK at night, fairly cheap yet unique experiences, and if it doesn't work, no big deal. Disney can close it and it will fade into the landscape like Discovery Island.