I actually wouldn't consider WiiU a flop in Japan. I believe that, given the circumstances and the market preferences, it is doing rather well. It certainly can be considered a flop outside of Japan. I also believe that WiiU can still post good Japanese numbers given the strength of their IPs and their potential to attract Japanese consumers.
Sony can currently be considered a disappointment, it would be too premature to call it a flop after 75 days on the market, while putting out only 4 games during that period. It will never reach historic successes, but a steady inflow of quality games for the Japanese consumers can certainly make it a competitor.
I don't dare predict which of the two will come out on top, to quote the true outsider in Japan: "It's not a sprint, it's a marathon".
