The Wii isn't un-modable, I have modded over 20 so far without problems.
They all have different chipsets in them and its the latest one which isn't even out everywhere that is un-modable and this one has a D2C chipset in it and there is hardly any of these about.
All the ones with DMS, D2A, D2B chipsets can be modded just fine.
The Wii had chips for it within weeks of it being released, the Wii has been perfectly modable for over 6 months.