Would you like the main series games any more/less if they were on consoles instead of handhelds?
Less. I have always been a handheld gamer first and foremost - due in no small part to Pokemon. Pokemon Colosseum and XD weren't bad games by any means, but they were awful compared to the handheld titles, because they cut so many corners. They COULD have given us a proper version, but instead they watered it right down and made it a linear, thoroughly-dull story driven experience. Sure, it'd look prettier, but who cares? The 3D models they're using in the 3DS games are flat and ugly and overly polished; the sprites were rougher but had a lot more charm; they fit Pokemon perfectly.
But let's assume for a wild moment that they wouldn't do that again, and they'd make a proper mothership title on the Wii U, with routes and badges and everything else that makes Pokemon...Pokemon. You wouldn't be able to trade between your versions unless you had two consoles, for starters. You wouldn't be able to take it outside and battle with your friends; as bad as Streetpass is, it's a lot better than Miiverse. Portable connectivity is a huge part of Pokemon and, of course, that'd be taken out if you put it on a console.
In short, Pokemon is a series that I feel is betst suited to handhelds, and I can't see a console version ever being very satisfying.