It used to be that December 7 would be non-stop coverage and commemoration. This year Pearl Harbor didn't even make it to the "On this day" on the Wikipedia home page. 
I'll give them partial props for making Arizona today's featured article.
I will refrain from ranting about history elitists, and instead say this. (That counts as my rant)
The fact is, people are less connected to Pearl Harbor than decades ago. People that were alive and remember when it happened, had a lot more connection to the event emotionally and would watch non-stop coverage of it.
Today, very few people are still alive that remember Pearl Harbor. To most people, the significance is it was the event that lead the United States into WWII. If it were on non-stop all day, people would turn the channel, or go watch Netflix. You see 9/11 stuff on all the time because the vast majority of the population remember it, over time that will fade too.
It will be remembered, and people know the significance. But it will lose its emotional meaning.