Seriously people, skip key words like under and construction
Anyways, I imagine a great arena system would be like if they were gladiator battles, with every man to himself pitted against a mix of players and monsters in a big ring. Now that, would be cool. Sans olive oil and overwhelming testosterone.
And turn-based fighting systems are a bit boring. Kinda why the story was the only thing keeping me fighting in every single final fantasy game there ever was ( except 6, that was fun

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And Moogie\'s right, most people pull things from every other game they have played, although I do admit some are good games, but why again would you want to play some crappy (idiodic), marketing srategy-driven card game in a mmorpg. I thought that\'s why there was Yu-Gi Oh on the GBA and the PS/2.
Although, it would be cool to have some sort of game you can play inside PS, like crystal checkers or something,
