Now that I've read up on it, and that all of you so nicely explained it, I see no problem with this move.
Except for the name. Had they called it the 3ES, 3XS, 3GPS or whatever, nobody would complain. It would have been like the move from DS to 3DS -- you get new games as well as backwards compatibility.
Same now. I see no reason to complain, as this obviously is a superior system that will play all of your old games as well as some new ones.