All the systems from what I understand are now able to do "firmware upgrades" so if there is a hack, a mod, then when a company is ready they can fix the firmware by changing the firmware...we shall see what happens to my 360 in a few days when the new dashboard comes out...
About the firmware updates/upgrades. Nintendo has had the option to update/upgrade the NDS' firmware sence day 1. In fact they did actually update once with the WFC emergance and Mario Kart, which is why FlashMe v4 came out. Nintendo didn't stop piracy then, and hasn't still. Why would they do it with the Wii, but not the DS?
About the Xbox 360. The update already came out, at least in the US, and it didn't bring any bans with it. It did however mess with some people's DVD-roms and made them re-flash the firmware. But as long as you're using the newest Sammy firmware (hitachi's weren't really hit that hard) you're cool.
And to the comment about wireless LAN. Yeah I know that a Wifi card will do the same things a wired card will, but the thing is, Mario Kart Double Dash wasn't programmed to use a wireless card, so if the Wii doesn't use some type of wrapper to fake the game into thinking it has a broadband adapter, LAN mode will not work. Same goes for any homebrew code that implemented LAN funcionality. The broadband adapter is crucial to creating backups for the GC and for software hacking it. I guess I'll just have to wait and see. But when I get my Wii the first thing I'm doing is putting in my AR and atempting to boot my backup of SSBM.
So what I hope for is that:
1. Nintendo didn't put some sort of blockage to booting the Action Replay, and if they didn't..
2. Nintendo didn't put some sort of blockage to buffer overflow exploiting the AR disc, and if they didn't..
3. They implemented a way for the Wii to emulate the wired broadband adapter for backwards compatability well enough for homebrew to work enough to create a backup.