So, who thinks they're going to make Mirage Arena an online thing?
Personally, I find it more likely that they'll scrap the online idea and just make it a single player world. However, the idea of implementing online multiplayer is a big marketing ploy nowadays, so it may actually serve in their favor to make it online.
At the same time, online multiplayer has become something of a gimmick these days ever since developers thought it was mandatory to have an online mode after it became so popular, and thus people aren't instantly sold on a game if it includes online. So, it could go either way.