Considering these games will be playable through the DS systems, if they hadn't upgraded the graphics to 3D like it is now, then it'll still give fans the feel that they are playing through Fourth Generation again, but just somewhere new. In some areas the 3D graphics implemented seem a little "odd" by camera angle, but no way near are they close to being terrible. It's this step that pushes the games and makes this generation another step up from all other past generations. I mean looking back at just the Fourth Generation to this, it's like a whole new game on a whole new system, but it isn't. So, I can definitely agree and say that the 3D aspects of Black and White have really improved these games alone from traveling through cities to the battle scenes.
If you want to go way back and compare RBGY to what we have here, then by all means, Pokémon has taken a gigantic leap and has definitely restarted the franchise once more.