Eh, a lot of videogames are at that point, IMO.
Oh, and on a word about competition: Just shut up about it. Seriously, let kids be kids, and let the other kids be other kids. I play SSBB as competition, and I also play DDR as competition. Both I can enjoy as casual experiences too. Just because one tournament doesn't recognize a game where another tournament does for their competition, does not discredit any competitive nature. The discussion here is about Sony All-Star Battle Royale (Hoping that name changes) and the outlook for it. The comments of it being a clone of SSBB could be legible, but that can also be on the same level of, "I wrote a book, then he wrote a book after me with the same moral, it must be a clone!"
Stretched example, but you get the idea. Wait until there's more information before stating completely, "It's a clone!" Yes, they have a wii in their dev room. Guess what? It's for research for a basis on a game that was popular so that they can drive their own franchise for the same popularity. Andamiro did the same when it came to a dance game, and Konami sued. I can't recall all the details, but simply put, Andamiro still makes Pump It Up, and Konami still makes Dance Dance Revolution, and their popular in their respective countries. No doubt the same might occur here, with some (possibly me... okay, probably me) who cross references between the two because they enjoy the style of the game.