Smash must have the element of randomness; random stages, random items. This is how the game was designed to be played. Likening it to sports, the pro version of soccer uses the same rules we use in our bar leagues, conversely, a game of poker on our 25-cent stakes table has the same element of randomness that the pro games have.
Okay...
Now let's look at eSports. Starcraft 2, Dota 2 and LoL.
The most randomness you will get is critical hits in Dota and LoL as far as I'm aware, but they don't affect the games significantly.
If random items and hazard stages made for competitive tournaments then Smash Bros. would be played in tournaments with random items and hazard stages like it was on the US West coast initially. Unfortunately the guys on RFN don't seem to understand competitive games at their core. It's not really bad or surprising really, I realize there's a large gap between non-competitive and competitive gamers so I don't expect you to be experts on the topic, I just hate it when you talk about things like this because of it.
If you are concerned about the competitive players "tainting" Smash Bros. due to the competitive aspect, well, ever heard of Brawl? The one no one plays competitively because it's not as competitive as Melee? Remember the countless times Sakurai has said the competitive scene is not his focus? I don't really understand where this is coming from.
I hope that this new game will be viable competitively like Melee. If anything I am worried that it won't be competitive, and that Melee will be phased out, because it's a great, versatile competitive game. I don't see why you want to "sacrifice" the competitive scene when Melee was just as good as a casual game. There has always been the option to pick the stage you want and the items you want, solid mechanics will only improve the game.