You're on two different aspects that don't fit with your argument. First you start off saying that it's kids today who don't know the property thus it's a dead license, but then go on with Capcom bringing the game back in a remake because of the popularity of the game.
Well if kids today don't know the Duck Tales license, then they clearly aren't the ones who knew the NES game. If they are rereleasing it because of the popularity of the original game, then it's aimed at those who knew the property beforehand and not these new kids. With the lack of marketing that Duck Tales received, and all the hype around the nostalgia, I think it's clear that it's unlikely many new kids who didn't know the license before likely bought it now.
Your theory that it's widely more known as a game than it is the cartoon only works if the number of people who bought the game now, and didn't know the Duck Tales license before outweighs the number of people who are familiar with the cartoon and who did play the original NES game. I think that's highly unlikely and thus you cannot say that Duck Tales is now more well known for the game than it is for the original cartoon.
I don't even think one can claim more kids under 10 have played the remastered game than have seen Ducktales via a parent's dvd or Amazon instant streaming.
And if we're talking about random all-ages, I bet more people could hum the TV theme right now than played the game. That was one of the songs kids on my bus sang during field trips. Disney Afternoon was just everywhere. Lunchboxes, coloring and sticker books, merchandise and plushies, etc. People who had never watched the cartoon knew there was a cartoon that spawned all of this merchandise.