A game these days is no longer going to catch people just with the idea of controlling a character in a story. It is a legacy of D&D that that has become not just common, but nearly universal.
Tabletop roleplaying must now compete with its children, and they are a multitude.
I guess that's pretty close to the truth. It takes some effort to get a child to play any kind of boardgame - not just rpgs - after it has been exposed to video games.
Still, it's worth introducing them to the concept, since it can be enjoyable in ways that video games cannot.
E.g. there's a regular column at a German video game website introducing great board games. Initially, the reactions in the forum were exactly as expected: "Who cares about board games if I can play <videogame> instead?" But eventually, the column attracted a following and is now quite popular. According to the posts the column managed to get several people to give board games a try again.
The main problem is that most didn't know many board games besides 'Monopoly' and 'Risk'.
Anyway, back tot he topic of rpgs:
I think it's always worth it having a great introductory product for rpgs. You cannot just rely on being taught to play by the veterans.
My first contact with rpgs was in 1984 with the release of DSA. A friend of mine had received it as a present and didn't have a clue what to do with it. So, together we tried to make sense of it and started playing.
A while later when we talked about it on the school bus, someone overheard our conversation and asked us if we'd be interested in trying to play 'AD&D'. The rest is history.
The original release of DSA wasn't actually a good introduction to RPGs. It pretty much assumed you already knew how an RPG worked! Later editions have been much better at explaining it, but they still have one problem: The rulebook is friggin' big and thus intimidating for a newbie.
These days many get interested in playing tabletop rpgs because they enjoyed playing computer rpgs or mmorpgs. But as I mentioned above about board games in general it's tricky to get them to 'adopt' it if the presentation isn't convincing and intuitive.
If it seems too much effort to learn the game, they quickly lose interest.