You are putting words in my mouth. I never said everyone will go along with it or certain players won't be upset. That is not any different than what is going on now. But this "not everyone can do it" barrier you keep bringing up is so specific, I doubt anyone active in the community will be effected by it, and aside from a radical few, butt-hurt enough about it to quit.
Remember, Smash players this late in the game are a dedicated bunch. We are talking about the same type of people who have no problem importing GC controllers and dropping dough on travel expenses for a video game tournament. It also is the same group of players that time and time again feel marginalized, either by Sakurai's less-than-competitive choices or by lame but necessary tournament rules, yet still come out to play and support the game. We have quite frankly put up with a lot of crap, but for the minimal fee of an SD card we can wash a lot of the obvious BS away.
You can't compare it to Gamecube Controllers as Brawl was programmed to accept them. So let's ignore how little sense that makes. And saying it won't affect the community is the the problem here. That's what you want to happen, isn't it? You admit MK is a problem, yet you're against doing something about him without hacks. Also, as pointed out earlier, not everybody likes hacks or constant patches either. So that's simply a matter of opinion if it helps the game or not. Also, the only BS that exists happens to be Meta Knight and Tripping. Removing tripping and only tripping would be the only acceptable thing as it really doesn't add anything good to the gameplay(but it DOESN'T HURT it as much as people say either.)
Sure, it's not free, but it's not like you are dropping money on something that serves no other purpose. The Wii's limited internal memory makes the SD card purchase worth it on its own. Just think of it as requiring the Gamecube memory card equivalent. It's also handy to have a portable Smash save for obvious reasons.
And you don't need it to play Brawl whatsoever. You're acting like it's necessary for BRAWL specifically. It's not. We've been over this before: The game is perfectly playable right out of the box. It's a fun endeavor, I agree, as I've used cheat devices in games to change huge gameplay, but it also has the obvious problems mentioned by Twinkle and Mic_128.
I would argue the edge rules are also out of hand, but that's just an opinion. Also I'm not following your logic here about tripping being a beneficial way to dodge things. Removing it though is definitely one thing that could excite people about using a Mod instead, but it is far from the only thing. We are talking about having a full roaster of characters, larger array of competitively viable stages, and a resulting streamlined ruleset. That is quite a bit to be happy about in addition to many more positives.
And no, I'm not going to just stop stating the obvious here because a couple TOs are against it. I'm not a sheep.
And one could completely argue that none of those "benefit" the game. Saying they're good for you isn't good for everyone. Some people like the original stages, and would rather not change what they are. Also, Tripping has been proven to not be completely bad, as it has invincibility frames. So even that doesn't need removing. You have to remember that what you call "beneficial" some people would shenanigans as is.
Yes, yours is an interesting choice, but that's it. It's not the "only good choice", since that's completely subjective. I do not think banning was the "only good choice" either, but as pointed out, it was the only choice that does not cause tons of turmoil from people asking for more and more hacks. Also, your problem really is with Nintendo and Sakurai for making the game unpatchable without using some form of modification done by a fan.(which as pointed out before, can be illegal unless the creating company approves. Which, by the way, they don't. They've made that clear before by their updates to remove hacks in general)
Lastly, I AM a TO, just not on the high level as the ones here. I've run them before. I've put rules in place(albeit, at a lower level) to ensure fair play. It worked perfectly fine. The biggest rule I ever had to do was to not allow Dittos(as in two people playing the same character on the same) on Double Tournaments. Other than that, I was very open to different choices so the community I was there for had fun.