Government designations aside, would you consider Superbowl Sunday to be a holiday? My impression of most native US citizens is that if they work on Sundays, they would like to have this day off to relax and watch the game. Many do take the day off.
I would say yes, and note that we certainly don't need anyone to create holidays for us. They will develop naturally on their own.
Speaking from a military perspective, I've managed to see every Super Bowl in more than 12 years of service, although I know a few people who did miss one now and then. But the Army works pretty hard to make sure people can see the game.
The only time I ever wanted to see a superbowl, 1985, in which my Bears won, I had to work.