New Super Mario Bros Wii didn't have a bundle. No reason for it.
Ail you've got it backwards. There are x many people in Japan who will buy a system for a game. Going by the Spring PS3 baseline, 45,000 of those people bought a PS3 for the FFXIII demo - but I think a substantial portion of the FFXIII fan base wasn't on PS3 yet, and many took the demo as a signal saying "get on board, its coming soon". The people who bought in the wake of the demo signal aren't going to be buying a PS3 again unless they sold their system or something. The success of the demo indicates the game will perform well, but the demo has almost the opposite impact on hardware, since many people bought a PS3 to play that demo and kept it.
In Japan, the Final Fantasy XIII fanbase won't be substantially more than 2.0m, if that. Even if the system did lift to 250,000 or something week one and never impacted PS3 hw again it would mean 1750/2000 of eventual FFXIII fans already owned a PS3. By percentage I actually think more Final Fantasy XIII fans than that own a PS3 in Japan, probably closer to 95% , which is why Square-Enix isn't worried about the performance of the game. If it performs anything like previous front-loaded games on PS3, week two may only be 15% of week one. Hardware won't fall that much of course, but that is because the PS3 baseline for the holidays is in decent territory already.
Since the demo launch, the PS3 base has grown about 900,000 and many of those purchases, about a two thirds, came when PS3 was cheaper and when FFXIII had an official launch date. So the overwhelming majority of the Final Fantasy base has to be on PS3 already, given that the title has been announced for PS3 since before it launched. Even a 60,000 lift from one game is actually quite enormous given that hundreds are available for each platform. PS3 has a 4m base in Japan. If it had 400 games, you could argue an average game convinces 10,000 people to buy PS3s even with hundreds of others available. I don't know that FFXIII is six times better than 'an average PS3 game' so a 60,000 lift is quite big and expecting anything more, when some of the baseline for PS3 is already being influenced by FFXIII purchasers is over the top I think.