You could argue that for a second place console, the PS3 is doing well. But the PSP, which is second place in the handheld department, is beating the wii on a weekly basis...
I have to say that consoles this gen have been a major disappointment. Imo it's because the split in 3rd party support (DQ and MH for Wii, FF, MGS and the yakuzas and mousou's for PS3). Also the huge decline in many games like PES, mousou, samurai warriors, tales, power pro baseball, etc.... helped in this decline
Historically the dominating console always had everything in japan. This time it was kinda like the Wii was leading without really having any support. And i guess the PS3 support was a bit too late for the PS3 to really get to PS2-like numbers. Even for all the PS3 support, i dont think it can be compared to what the PS2 had, even marginally... Handhelds have stolen the thunder in Japan! 3DS will probably see this domination continue