Since when do poker and blackjack have anything to do with smash bros? Yeah, thought so.
Anyway, I do play tournaments, not often (planning on MUCH more often when Brawl comes along) but I do participate in them and respect the official rules. If I wouldn't respect the rules, why would I bother to attend?
Likewise, as stated a trillion times before. We're not telling casual players how to play the game. When I play with my friends, half of the time it's tournament rules to practice. But the other half it's items on, all stages on and usually lightning melee or slow melee. Tournament rules never interfered with my playstyle outside of them... except for my practice sessions, but that's only natural since "competition" implies that you train your skills to be the better player.
As for all the "OMG if yur s0 pr0 why dun j00 b3 pr0 0n 4LL t3h st4g3s?" comments ; The real pro's would probably still win from non-professional players on every stage, simply because they have more experience. These ruleset is applied to "professional versus professional" matches. (or at least "competetive versus competetive") In these matches, players are often very close to each other in terms of skill and therefore the randomness of the playing field has a much bigger impact on the outcome of the match.
Example:
One player's "skill level" (there is no such as skill levels (I know I'm gonna get a 9000 joke here...) but suppose skill is something you can accurately measure just for this example) is 49 and the other player's skill level is 51. Then there's playing field in which certain random events can give any player a "+10 bonus." Random event happens, the player with skill level 49 get's the bonus, he now has an advantage over the other player where he normally wouldn't have of his own.
Now suppose one player's skill level is 10 and the other's is 90. Even with a "+10 bonus" the former player would be horribly owned by the other (4 stocked even, when you calculate this).
See the point? The ruleset is so randomness or chance would have less or no impact on players who are close to equal in terms of skill. (Hope this made sense)
As for "then don't be cheap!"... Well, the game "allows" me the opportunity to be cheap, so why wouldn't I take it? There is no deus ex machina game mechanic that will prevent me from using cheap tactics, hence, I use them because I can. Also, as stated again a trillion times before, the line to be drawn here would be a blurry one, opposed to stage banning where the line is as clearly drawn as you can get.
And hey, I'm a Kirby main, I use every cheap advantage I can get to win
And as for the fact that owns them all but many people fail to grasp: "Nobody forces you to come to tournaments or play by those rules in your own environment, we thank you for you understanding."
Also, nobody says you can't host your own items-on/all stages allowed/free for all tournament. If you want to, what's holding you back? Feel free to do so!
Now as for the actual main topic which is how the common sense applied to stage banning in Melee will be applied to Brawl stages...
I predict (EMPHASIS on PREDICT):
Battlefield = Legal (Besides graphics it's unchanged)
Smashville = Legal (Final Destination with an AC background and a platform)
Lylat Cruise/Pleiades = Legal (Final Destination with three platforms)
Delfino Plaza = Legal (It moves yes, but no real hazards or unfair advantageous spots)
Castle Siege = Debatable (The movement isn't a problem, the roof and basement aren't either, the middle room might be...)
Summit = Banned (A whole lotta whackiness going on here)
Mario Circuit = 75% chance banned (Shy Guys and ledgeless)
New Pork City = Banned (Hyrule Temple X2 with an instakill stage hazard)
Rumble Falls = Debatable (Depends on the speed of the stage's movement and it's hazards on the way up)
Norfair = Debatable (Tidal waves of Lava)
Skyworld = Debatable (I heard you can meteor smash/spike someone through the clouds)
Yoshi's Island = Legal (The Ghost doesn't give a real unfair advantage)
Pokemon Stadium 2 = Debatable (Much whackier than the first one)
Bridge of Eldin = Banned (Length, ledgeless, bombs, arrows, bridge being destroyed)
Halberd = Debatable (Depends on how the cannon works)
Helipad = Debatable (Depends on how much of a hazard the Metal Gears and Spotlights are)
There... Darn that was a long post O.o