ummm... come on. you know the specs of the wii?
it's nothing more than an improved GameCube.
Processors:

* CPU: PowerPC-based "Broadway" processor, made with a 90 nm SOI CMOS process, reportedly† clocked at 729 MHz[70]
* GPU: ATI "Hollywood" GPU made with a 90 nm CMOS process,[71] reportedly† clocked at 243 MHz[70]

* Memory: 88 MB main memory (24 MB "internal" 1T-SRAM integrated into graphics package, 64 MB "external" GDDR3 SDRAM)[72]
* 3 MB embedded GPU texture memory and framebuffer.

http://en.wikipedia.org/wiki/Wii#Technical_specifications

so, even if you get a license to develop for the wii, you will by no means be able to port the next-gen look of Unity to that machine. not with 88 MB RAM and a 729MHz CPU. 3 MB texture memory? have fun.