I don’t think D-Day will ever be “forgotten”. There are a lot of references to it in popular culture, including movies and video games. That being said, its not a national holiday and (while an Earth-shaking event) WWII is slowly fading into the past. We don’t really commemorate the Battle of Gettysburg today and I suspect (at some point) D-Day will be much like that.
My wife and I went to see the traveling replica of the Vietnam Wall and was standing behind a high school girl and her mother. Her mother was trying to explain some things about the Vietnam war. Her daughter said that they weren't taught about that, World War I and II, Korea, and the Gulf wars. I thought how sad that wasn't taught or if it was, it was probably glossed over enough as to make little or no impact. Perhaps that's what she meant. At any rate, it was sad to hear that. Major events such as those deserve time and study. There is much to be learned from each of those events. Such as today, the 67th anniversary of D-Day. On that day, Medals of honor could have been given out like Chicklets. There was examples of untold heroism displayed by the minute. Those who took part in that operation didn't want to be there but they realized that if they weren't there, the war would have drug on much longer than it did. Because of their sacrifices, the war in Europe came to a much quicker conclusion.
I was born eleven years after that happened. I had no part in that. I am, however, immensely grateful for what they did to rid the world of that era's lunatic. It is now our era. We have our own lunatics to get rid of. And kids like that girl needs to learn about all of that.
That being said, its not a national holiday and (while an Earth-shaking event) WWII is slowly fading into the past. I was greatly embarrassed in Paris last month, when many things were closed on May 8, because it is a national holiday. I asked what holiday, and was looked at in disbelief - it's V-E Day, and they still commemorate it. I'm past 50, and the only commemoration here that I remember EVER was the 50th anniversary in 1994.