I'm going to vent for a second and make a huge, sweeping generalization.
EVERYONE WHO THINKS THAT REMOVING TRIPPING FOR TOURNIES IS STUPID IS IN SUPPORT OF A GAME MECHANIC THAT OFFERS NOTHING TO THE GAME AND ONLY EXISTS TO SCREW YOU OVER AT RANDOM TIMES.
Okay, that's done.
However, I can't emphasize more that tripping, unlike other random elements, is not a risk-reward situation. You use G&W's hammer aware of the risk of getting a poor number and hoping to be rewarded for your risk-taking with a high number. You accept the chance. When you use Luigi's Green Missile, you're either hoping for a misfire or hoping to not misfire, and you accept the risk of something happening that you didn't desire. When pulling turnips with Peach, you know that you may have a chance of getting something out of the ordinary and you're prepared to use it if that's the case.
However, tripping is just horrible. It has no risk-reward mechanic (other than moving and hoping to not trip). It has no purpose in the game. It has NEVER BEFORE been in a fighter because never before has a fighter been made in such poor taste and vision to the point where something like this seems like a good addition.
I personally work on modifications to create a more Melee-style Brawl, such as more hitstun, but I would never even consider those to be used in tournies, never mind become a standard. Those are just being created for the sake of seeing a better game that can be played for enjoyment and for the possibility of a large portion of the community accepting it.
Removing tripping, however, is the ONE modification that I would expect to become a tourney standard. It's binary rather than analog (on/off versus a value) so there's no horrible discussion on "how much is enough". It's a very slight change, with no downsides, that only serves to prevent occasional distress and even more rare complete tragedy at absolutely no cost. Although I don't expect to see it become a universal standard for some time, many TO's are already prepared to utilize it in finals and everyone opposed to it just has a very non-competitive view of gaming. Honestly, I can't tell you how many times I've lost because of a trip.
On the subject of sneaking in other modifications: it's pretty easy to check what codes are being loaded, just slap the SD card into a computer that can read it and check the enabled codes. As it is the only codes that would be useful if slipped into a Wii would be the offense and defense modifiers, which not only would be noticed by anyone who knows the damage percentages of certain moves (which most competitive smashers do, if just to exclaim the cheapness of something; often they'll say "look at Snake's ftilt, it just did 21% fresh, that's ridiculous) but it also only alters specific character slots, and it can be somewhat random what slot you get in a tournament unless you're adamant about it (which draws attention to the illegal modification).