Character builder anyone? ;)
Fuck no.
"However, the plan is for that stage to vanish once one day has passed. It’s a once-in-a-lifetime encounter."
So, if its a really good stage, you can't keep it? Lame 
I've thought about this as well. They may make it so you can download the stage onto your SD card. If they don't and if a stage is good, I'll probably just pause, copy the stage down, and remake it myself.
Maybe in a typical fighting game, but half of smash bros fun is the crazy stages and how well you can play on them
This is what you don't understand. What's fun for you may not be fun for someone else. People who play by tournament rules play because they find them fun; they wouldn't be playing if they didn't.
Just as a question for tournament players: why is it that all the house rules for tournaments seem to be about trying to remove as much depth from the game as possible? I understand taking away elements that rely on randomness (sorta. In that I see why people would whine if you didn't--players who refer to themselves as "competitive" almost always have excuses for making the things they're not good at illegal), but I don't get why you would remove strategic elements.
The same question begs itself when I hear people talking about disabling smash balls and all this other stuff. It's like they want the competitive game to be as arbitrarily unlike the actual game as possible.
Here's basically how this works. Tournaments are meant to be a test of skill. The player with the most skill is meant to win. Now, most scrubs complain that tourney players are lame and suck because they can't handle random elements in a game and some think they could actually win if items and random stages were allowed. Truth of the matter is, if you had items and random stages on, the pro would still kick the scrub's ass. The competitive players tend to have much better reactions and can think very clearly even in a tough match. That's what makes them good.
Now, when you have only good players playing in a tournament, the difference in skill level is only a fraction of what it is compared to the difference of a pro and scrub. That being said, random elements could fuck the player that is truly better and actually cause him the match (or possibly the tournament) because the player who is worse may just get lucky and win. And as you may or may not know, tournaments are not tests of luck, but tests of skill. Yes, each player should be able to use items just as efficiently as the next, but one player usually gets lucky and ends up getting most of the better items because they spawn closer to him. The randomness/luck factor evens out eventually for every player, but it takes several matches to do so and tournaments are only 2-3 fights per set, which is why they're usually taken out. However, there are items tournaments out there for those who really can't live without them.
If you were in an intense fist fight with someone and there was a chance of someone jumping in and punching either you or your opponent in the nuts randomly, would you want to take that chance?
What I don't understand however, is why people who have never been to a tournament, will never go to a tournament, and will never play against tournament players even care how they play? I think I've explained Shadowtext's question pretty accurately. I'd like to know the answer to mine.
EDIT: I'm thinking of a platform only stage with no solid ground. I think it could work pretty well. I wonder if they'll have platforms you can spike through like in the Sky World stage.