I will deny you your competitive battle platform, but Revolution was nothing more than a battle platform, and all Stadium had going for it was the mini games. (and sped up gameplay before emulators as we know them now existed) Colosseum and XD had the most reason to exist, but I can still regard it as little more than a playground for advanced players. I'll have to check, but I have reason to believe that this idea was phased out since now, an advanced environment is provided by the game itself in the form of battle facilities. True, I know this was started in Crystal, and continued in Ru/Sa, but it didn't become something people were impressed by until Emerald's Battle Frontier. D/P only had a battle tower, but the frontier returned in Platinum. Anyway, the primary function these games served is no longer necessary. One can question if Revolution itself needed to exist since Wi-fi sort of made the idea of gathering to battle pokes via console a moot concept. (although it in itself also used the Internet to battle the entire world) The only purpose it had left was to show pokes in 3D. They found another way they could use models, via Pokepark. True, I guess the niche of 3D battling was still absent for this gen. Given the Wii, would it really have been that much of a loss? Did you really want another Revolution? If you wre expecting Stadium or Colosseum to return, you're deluding yourself. As a consolation, Pokepark does have the screwy minigames, but not the battling. Now that X/Y is taking away the 3D thing, I think the idea is officially dead. If you want your battles, you can have them over wi-fi now. If you want the advanced challenge, there are battle facilities for that. It no longer has a purpose.
