Well yes, removing advanced techniques is what divided the scene in the firs tplace. had this not happened, I'm sure we'd be much less divided in the first place.
I don't think so. I think the scene was divided due to childish insecurities between members of both communities. Hear me out:
I'm a Melee player too (see my sig) and know what you're talking about. Let's forget what Brawl took away though and what Brawl introduced: a whole amount of people to the Smash Bros series. Look how many we've got playing Melee now, some even playing several in the entries or even all of them. Think about how Smash 4 could benefit the community overall with this too.
But now, introduce the childish insecure arguments against other games. I say these are "childish insecure" because really, the only reason to hate on another game is to get all angsty and paranoid that it's going to "kill" your own game. Btw, it's not, Melee's been alive for 14 years. Can you honestly blame someone for not wanting to play or get involved with Melee based on the comments they received from a Melee player? I wouldn't really blame them.
Brawl may not have been what most Melee fans wanted (it wasn't my favorite Smash game, that's for sure), but the divide between people isn't something that had to happen, and is something we should work towards joining together. Just because Brawl isn't my favorite game doesn't mean I hate the people who play it. That's childish. I would much prefer to introduce people to my game without insulting them, just like they introduced me to theirs.
If more members of the community would get over their childish, insecure arguments with each other, and if we instead approached each other with an open mind and listened to each other instead of flinging crap at each other, I assure you we wouldn't be as divided as we are now. And when I say we, I'm not just including the Melee community, but also the entire Smash community in general.