The main point here is that, the DS is still selling strong and nothing has been done about flash cards, etc. There would be no point anymore. Piracy is here to stay. With the Wii, the only real way to tell if you are playing pirate games is by checking what game saves you have on the machine, why for example would you have a JAP Resident Evil 4 save on your PAL machine.. but by looking into the system, this would be some sort of privacy invasion and would be illegal.
With regards to updates on games etc, these are intended for specific regions, if you brick you PAL wii because you played a USA game with an update, Nintendo did not intend this update to be run outside USA, its not in the slightest an attempt to stop piracy, just provide the correct region Wiis with free updates to help run the game.
Even so, the percentage of pirate users is fractional, many peope are put off from the bricking stories and the soldering etc... id say maybe 20% are modded out of all the machines since launch? I know so many people with various consoles, very few of them know iso's and modchips exist. They buy originals and are happy at doing so.
I buy originals of all movies, albums, games i truly love. I prefer to have originals of stuff in my favourites. Im not the only one who thinks this way.
My wii is modded, it allows me to play homebrew and try out wii games too.
I think the massive sales of the Wii, and the low percentage of modded ones... Nintendo are happy with its success and the success will continue and the pirates will only be a small problem for them and overlook it like they have with the massive success of the DS.