I don't understand all the hate for the 2DS.
If you're happy with your 3DS, then great! This isn't a purchase which will impact the future release of any new games, nor will it entice you to buy something you don't need. In fact, the 2DS won't influence your gaming experience at all.
There are people who can't deal with 3D for medical reasons, or simply because they feel queasy when playing it (which is perfectly understandable, given that you have to hold the console basically stationary to alleviate 3D-induced headaches), and this is the perfect solution for them. Sure, there's a slider.. But accidents do happen, as much as some people would like to deny that fact.
Let them have a version of the new DS they can deal with (and still play all the new games on), and shut up. It's not hurting you.