I was interested in one myself until I saw how tiny the screen is. I think it's a good idea.
It's the same size as the normal 3DS I believe. From the images and videos it does look very small.
OT: People like to bitch about stuff they won't even going to buy. That's how humanity works. I personally believe this is a great idea and should boost the sales by a decent margin, and heck if I had not bought a 3DS a couple of months ago I would have probably pick this one up since I don't care about 3D and I never take my 3DS out of the house.
Nintendo and PC gamer