No Blue his post was not useless he is absolutely on the money. The Famitsu top ten list doesn't not indicate that game will sell well. The Famitsu top ten list is essentially what the hardcore Japanese gamer is looking forward too. Japanese market sales are determined in the most part by the casual gamer.
Final Fantasy XIII will certainly spike PS3 sales. Unfortunately for Sony the most popular RPG series in Japan is Dragon's Quest and that is on DS. That said both DQ and FF games share the same sales trait. The game sells millions the first week and then proceeds to drop like a rock. Do your realize how far the Wii will be ahead of the PS3 in Japan by the time April of 2008 gets here. Assuming that there aren't any Final Fantasy fans that own PS3s in Japan right now and all of them ran out and bought PS3s when FFXIII releases, the PS3 would still be behind the Wii.
Going by current sales trends and assuming there is not holiday sales spike the Wii will be at bare minimum 4 million units ahead of the PS3 in Japan. So lets recap, if there is no holiday sales spike for Wii, if no Final Fantasy fans own a PS3 now, and if they all buy a PS3 for FFXIII at release, we are looking at 2.5 to 3 million PS3s being sold that week which would put the PS3 1 to 1.5 million behind the Wii. And that is using a favorable scenario for the PS3, because the sales gap between PS3 and Wii isn't holding steady its growing, there will be a holiday sales spike, and there are Final Fantasy fans that own PS3s in Japan right now.