Riding dragons is an inherently ridiculous thing to do. It looks silly and over-the-top. It obliterates any sense of the initial restrained design sense that the developers offered up. How to Train Your Dragon was an awesome movie, but it doesn't fit in with the overall aesthetic of this game.
Like I said, I know I'm not being asked to play it. I just don't like seeing people take a really good design and run it into the ground (or in this case, put it in the air).
False. Dragon riding is already in the lore from past games.