I'm not sure why a role-playing-game is needed when there's already a game tag. Personally, I think we should just burninate it and add the game tag to all the questions tagged with it that don't already have the game tag. I just don't think that we need specific tags for genres of games, when a game tag suffices.
No, do not burninate
We do need specific tags for games. See Game tag - When to create own tag for games?
Some genres of games, are popular enough that they do deserve their own tag.
For example, I am a huge fan of minesweeper, having asked several questions about it and having spent countless hours analyzing the game, I am definitely interested in that tag.
Now, what does minesweeper and role-playing-game share with each other? Honestly, not that much. The game tag is a bit too unspecific. The only 'problem' with the game tags is to have tags that are specific enough, but still un-specific enough to contain a bunch of questions. I find role-playing-game to be a very good balance here.
If you think about the world outside Code Review (yes, there is one, or so I've heard at least), Role Playing Games (or RPGs) is a quite specific genre. It definitely deserves its own tag.