If Sony/Ninty bring out a portable the size of the Ipad, would you buy it?

[JEMC]

Nope, that thing would be too big to be called "portable", and the bigger screen would made games look worse than on the 3DS, PSP2 or whatever.

Yes, they'd share the same "pixels per inch", but not the same resolution so it'd have to rescale the image, making games look worse.