I'd be very surprised if Japan didn't quickly switch from the PS3 to the Wii U. Nintendo's going to have three of the biggest series (in some form or another) ready for launch. Nintendo's shown that they're being very aggressive when it comes to securing those major third party games. Something that Sony hasn't really done in a long time. So Sony can't just expect gamers in Japan to stick with them until the PS4 eventually launches.
We have to really ask ourselves how important console version of Dragon Quest and Monster Hunter really are? The console versions of both titles have yet to set the sales charts on fire. However, if you compare them to their portable counterparts, it's a while other story.