The best way to be sure that nobody will start a Project M 2 is making a good game and a satisfactory experience. Brawl wasn't, so it was modded.
Brawl is no means a bad game, or a bad Smash Bros. game.
The issue is the competitive scene started to gain traction around Melee.
Pros were able to abuse certain techniques that many casuals are completely unfamiliar with, which gave them an unfair disadvantage.
Everyone grew accustom to the Melee engine, and once a new Smash Bros game was announced they all expected Melee 2.0 with more characters.
A lot of these players still haven't even played 64, so they are unaware of the fact that Smash changes every single game, the jump from 64 to Melee being the most drastic.
But they still expected Melee 2.0 anyways.
So when they finally got their hands on Brawl, the first thing any logical Smash Bros player does is not try and see if you can wavedash, yet here they were trying that.
Now once everyone learned that the techniques that they figured out for Melee were not implemented in Brawl, they got upset.
There was no longer that competitive edge. The couldn't grasp the idea that L-Cancelling was done, so you needed to start your aerial attack higher.
When spending more and more time with the game, they hated the changes. "Felt too floaty" "too slow". Every complaint they had about the game was a direct comparison to Melee. There was no 64 love in there, nor is there ever. They could not comprehend change to the perfect engine that they mastered.
So they complained about all the changes. Yet complain about franchises like Call of Duty for making the same exact game over and over but with new weapons and maps. This is exactly what competitive Melee fans wanted, but would criticize COD for doing the same thing. With Brawl they complained about levelling the playing field too much, when that is not the case at all. Just because tripping was added doesn't mean everyone is automatically at the same experience level.
Then started the whole Melee vs Brawl argument that ruined this forum.
Melee fans came off as smug and arrogant, making fun of everyone who loved Brawl and trying to take away their joyful experience because they couldn't have a similar one with the game.
And Brawl fans are usually fans of the whole series, they never hated Melee, they just hated the fans.
Then finally some people hated Brawl so much they decided to make a hack for it to make it more like Melee.
Now we are at the beginning of a very scary potential forum threat.
The inevitable Project M v Smash 4.
It's already starting with people questioning Sakurai's game making abilities and wishing the PM guys made Smash 4.
They criticize every update with Smash 4 comparing it to something in Project M.
"Project M did the Light Suit for Samus better because they actually changed the model"
"Link's new tunic swap is dumb because it doesn't look 100% like it does in Skyward Sword, PM already made a Link without a hat"
Of all the care and attention this made puts into his games is it really a big ****ing deal if Link is still wearing his hat?
Even if Sakurai does something good for the competitive community (Final Destination stages for most stages, For Glory Mode) they find something to complain about.
I'm not blaming all competitive Melee fans out there because I know some are great, but god damn all you guys seem to do is complain.
I can't stress this enough... if you are complaining that a game isn't Melee, just go ****ing play Melee.
So to answer your questions 100% someone will hate this game so much and try to make a hack to make it more like Melee.