Why doesn't Nintendo build up their new franchises?

[alfredofroylan]

killeryoshis said:

Everyone here is know how the next big games are old franchises. Zelda,Mario and Metroid.
Now tell me this. Why can't they make new franchises that can be big million sellers also.
They seem to only focus alot on old franchises moreso than the new ones. Just look at the
best selling wii games here made by nintendo here

Like this franchise?

And BTW Excite Truck is a quite old franchise. (Excitebike from the NES remember?)