Yes, game hacks are totally trivial, they were just done to prove a point in a way our followers understand.
I have to say I quite strongly disagree with the idea of ever making a persistent exploit. I personally really didn't like the fact that the Homebrew Channel was persistent on Wii as it greatly increases the risk of bricking to go anywhere near the file system, and worse it's trivially detectable leading to a lot of paranoia about warranties or detection on the vWii for example. As far as I'm concerned, now we have a ppc kernel exploit we can do anything we would want to do with legitimate homebrew, loading an application as if it were a real one. Going any deeper just makes it easier for pirates for the sake of the slight convenience of having a Homebrew button on the menu. I'm not even particularly fussed about the common key, I've certainly not had access to it or any decrypted binaries (though I know the team behind the browser exploit did). I would much rather sit through the 20 extra seconds it would take to go into the browser and click a bookmark, so I'm certainly not looking for an IOSU exploit.