I see a really, really mixed reaction to this in the so-called hardcore community.
All I see is a DSi-style situation, where games such as Pokémon Black and White 2 would take advantage of the DSi hardware when it can, but still be available for older DS models.
Of course, I don't see Xenoblade being available for the 3DS to begin with.
I WON A BET AGAINST AZUREN! WOOOOOOOOOOAAAAAAAAHHHHHHHHHHHHHHHHHHH
:3