Are you unaware that you can edit posts, pokepal?
1. Handheld and console games should be treated differently, otherwise why separate them? However, that doesn't mean developers shouldn't have the option of a right circle pad available to them from the get-go and without an asinine add-on. It would have cost Nintendo cents per unit to have included a right circle pad vs $20 for consumers for the Circle Pad Pro. Handheld games should be treated differently in that it probably isn't wise to design a mandatory level that takes an hour to complete simply because that betrays the entire quick, on-the-go gaming purpose of a portable gaming system.
Being handicapped creatively because Nintendo forces developers to find ways around making games without something that's been a staple of game controllers for well over a decade is silly and insulting. It's similar to the Wii Remote, just taken to a lesser extreme. However, the Wii Remote was meant to be radical because of where Nintendo was in the console market. 3DS deemphasized the out-of-the-box thinking of both DS and Wii in favor of more traditional game development. It offered so many options, but it's missing an important component.
2. Other than simplicity, there's no reason to include one in a revision. It's too late to fix it now, but really, it shouldn't have been an issue to begin with. You can argue that the 3DS was too packed to include one, but research and development teams are employed to solve those problems.
3. Techncally, it would be the first revision since the XL is basically just a larger model. In any case, it probably wouldn't do any harm by the time a real revision would conceivably be released, next year at the earliest. By then 3DS will have been on market for three years. Most people wouldn't be confused over what it was, especially if Nintendo marketed it as "Circle Pad Pro included." It might not be worth the trouble depending on when Nintendo wants to launch a successor though that didn't stop them from launching DSi and that at least allowed Nintendo to launch DSiWare and work out the kinks. Unless a revision is really well-integrated with Wii U or does something that really improves the 3DS experience, Nintendo could leave well enough alone.